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Diffstat (limited to 'drivers/md/dm-ioctl.c')
-rw-r--r--drivers/md/dm-ioctl.c109
1 files changed, 74 insertions, 35 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 8edd6435414d..3edb3477f987 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1,6 +1,6 @@
/*
* Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
- * Copyright (C) 2004 - 2005 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004 - 2006 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
@@ -19,6 +19,7 @@
#include <asm/uaccess.h>
+#define DM_MSG_PREFIX "ioctl"
#define DM_DRIVER_EMAIL "dm-devel@redhat.com"
/*-----------------------------------------------------------------
@@ -48,7 +49,7 @@ struct vers_iter {
static struct list_head _name_buckets[NUM_BUCKETS];
static struct list_head _uuid_buckets[NUM_BUCKETS];
-static void dm_hash_remove_all(void);
+static void dm_hash_remove_all(int keep_open_devices);
/*
* Guards access to both hash tables.
@@ -73,7 +74,7 @@ static int dm_hash_init(void)
static void dm_hash_exit(void)
{
- dm_hash_remove_all();
+ dm_hash_remove_all(0);
devfs_remove(DM_DIR);
}
@@ -102,8 +103,10 @@ static struct hash_cell *__get_name_cell(const char *str)
unsigned int h = hash_str(str);
list_for_each_entry (hc, _name_buckets + h, name_list)
- if (!strcmp(hc->name, str))
+ if (!strcmp(hc->name, str)) {
+ dm_get(hc->md);
return hc;
+ }
return NULL;
}
@@ -114,8 +117,10 @@ static struct hash_cell *__get_uuid_cell(const char *str)
unsigned int h = hash_str(str);
list_for_each_entry (hc, _uuid_buckets + h, uuid_list)
- if (!strcmp(hc->uuid, str))
+ if (!strcmp(hc->uuid, str)) {
+ dm_get(hc->md);
return hc;
+ }
return NULL;
}
@@ -191,7 +196,7 @@ static int unregister_with_devfs(struct hash_cell *hc)
*/
static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md)
{
- struct hash_cell *cell;
+ struct hash_cell *cell, *hc;
/*
* Allocate the new cells.
@@ -204,14 +209,19 @@ static int dm_hash_insert(const char *name, const char *uuid, struct mapped_devi
* Insert the cell into both hash tables.
*/
down_write(&_hash_lock);
- if (__get_name_cell(name))
+ hc = __get_name_cell(name);
+ if (hc) {
+ dm_put(hc->md);
goto bad;
+ }
list_add(&cell->name_list, _name_buckets + hash_str(name));
if (uuid) {
- if (__get_uuid_cell(uuid)) {
+ hc = __get_uuid_cell(uuid);
+ if (hc) {
list_del(&cell->name_list);
+ dm_put(hc->md);
goto bad;
}
list_add(&cell->uuid_list, _uuid_buckets + hash_str(uuid));
@@ -251,19 +261,41 @@ static void __hash_remove(struct hash_cell *hc)
free_cell(hc);
}
-static void dm_hash_remove_all(void)
+static void dm_hash_remove_all(int keep_open_devices)
{
- int i;
+ int i, dev_skipped, dev_removed;
struct hash_cell *hc;
struct list_head *tmp, *n;
down_write(&_hash_lock);
+
+retry:
+ dev_skipped = dev_removed = 0;
for (i = 0; i < NUM_BUCKETS; i++) {
list_for_each_safe (tmp, n, _name_buckets + i) {
hc = list_entry(tmp, struct hash_cell, name_list);
+
+ if (keep_open_devices &&
+ dm_lock_for_deletion(hc->md)) {
+ dev_skipped++;
+ continue;
+ }
__hash_remove(hc);
+ dev_removed = 1;
}
}
+
+ /*
+ * Some mapped devices may be using other mapped devices, so if any
+ * still exist, repeat until we make no further progress.
+ */
+ if (dev_skipped) {
+ if (dev_removed)
+ goto retry;
+
+ DMWARN("remove_all left %d open device(s)", dev_skipped);
+ }
+
up_write(&_hash_lock);
}
@@ -289,6 +321,7 @@ static int dm_hash_rename(const char *old, const char *new)
if (hc) {
DMWARN("asked to rename to an already existing name %s -> %s",
old, new);
+ dm_put(hc->md);
up_write(&_hash_lock);
kfree(new_name);
return -EBUSY;
@@ -328,6 +361,7 @@ static int dm_hash_rename(const char *old, const char *new)
dm_table_put(table);
}
+ dm_put(hc->md);
up_write(&_hash_lock);
kfree(old_name);
return 0;
@@ -344,7 +378,7 @@ typedef int (*ioctl_fn)(struct dm_ioctl *param, size_t param_size);
static int remove_all(struct dm_ioctl *param, size_t param_size)
{
- dm_hash_remove_all();
+ dm_hash_remove_all(1);
param->data_size = 0;
return 0;
}
@@ -524,7 +558,6 @@ static int __dev_status(struct mapped_device *md, struct dm_ioctl *param)
{
struct gendisk *disk = dm_disk(md);
struct dm_table *table;
- struct block_device *bdev;
param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG |
DM_ACTIVE_PRESENT_FLAG);
@@ -534,20 +567,12 @@ static int __dev_status(struct mapped_device *md, struct dm_ioctl *param)
param->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor));
- if (!(param->flags & DM_SKIP_BDGET_FLAG)) {
- bdev = bdget_disk(disk, 0);
- if (!bdev)
- return -ENXIO;
-
- /*
- * Yes, this will be out of date by the time it gets back
- * to userland, but it is still very useful for
- * debugging.
- */
- param->open_count = bdev->bd_openers;
- bdput(bdev);
- } else
- param->open_count = -1;
+ /*
+ * Yes, this will be out of date by the time it gets back
+ * to userland, but it is still very useful for
+ * debugging.
+ */
+ param->open_count = dm_open_count(md);
if (disk->policy)
param->flags |= DM_READONLY_FLAG;
@@ -567,7 +592,7 @@ static int __dev_status(struct mapped_device *md, struct dm_ioctl *param)
static int dev_create(struct dm_ioctl *param, size_t param_size)
{
- int r;
+ int r, m = DM_ANY_MINOR;
struct mapped_device *md;
r = check_name(param->name);
@@ -575,10 +600,9 @@ static int dev_create(struct dm_ioctl *param, size_t param_size)
return r;
if (param->flags & DM_PERSISTENT_DEV_FLAG)
- r = dm_create_with_minor(MINOR(huge_decode_dev(param->dev)), &md);
- else
- r = dm_create(&md);
+ m = MINOR(huge_decode_dev(param->dev));
+ r = dm_create(m, &md);
if (r)
return r;
@@ -611,10 +635,8 @@ static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param)
return __get_name_cell(param->name);
md = dm_get_md(huge_decode_dev(param->dev));
- if (md) {
+ if (md)
mdptr = dm_get_mdptr(md);
- dm_put(md);
- }
return mdptr;
}
@@ -628,7 +650,6 @@ static struct mapped_device *find_device(struct dm_ioctl *param)
hc = __find_device_hash_cell(param);
if (hc) {
md = hc->md;
- dm_get(md);
/*
* Sneakily write in both the name and the uuid
@@ -653,6 +674,8 @@ static struct mapped_device *find_device(struct dm_ioctl *param)
static int dev_remove(struct dm_ioctl *param, size_t param_size)
{
struct hash_cell *hc;
+ struct mapped_device *md;
+ int r;
down_write(&_hash_lock);
hc = __find_device_hash_cell(param);
@@ -663,8 +686,22 @@ static int dev_remove(struct dm_ioctl *param, size_t param_size)
return -ENXIO;
}
+ md = hc->md;
+
+ /*
+ * Ensure the device is not open and nothing further can open it.
+ */
+ r = dm_lock_for_deletion(md);
+ if (r) {
+ DMWARN("unable to remove open device %s", hc->name);
+ up_write(&_hash_lock);
+ dm_put(md);
+ return r;
+ }
+
__hash_remove(hc);
up_write(&_hash_lock);
+ dm_put(md);
param->data_size = 0;
return 0;
}
@@ -790,7 +827,6 @@ static int do_resume(struct dm_ioctl *param)
}
md = hc->md;
- dm_get(md);
new_map = hc->new_map;
hc->new_map = NULL;
@@ -1078,6 +1114,7 @@ static int table_clear(struct dm_ioctl *param, size_t param_size)
{
int r;
struct hash_cell *hc;
+ struct mapped_device *md;
down_write(&_hash_lock);
@@ -1096,7 +1133,9 @@ static int table_clear(struct dm_ioctl *param, size_t param_size)
param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
r = __dev_status(hc->md, param);
+ md = hc->md;
up_write(&_hash_lock);
+ dm_put(md);
return r;
}
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