diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/md/dm-ioctl.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/md/dm-ioctl.c | 1782 |
1 files changed, 0 insertions, 1782 deletions
diff --git a/ANDROID_3.4.5/drivers/md/dm-ioctl.c b/ANDROID_3.4.5/drivers/md/dm-ioctl.c deleted file mode 100644 index a1a3e6df..00000000 --- a/ANDROID_3.4.5/drivers/md/dm-ioctl.c +++ /dev/null @@ -1,1782 +0,0 @@ -/* - * Copyright (C) 2001, 2002 Sistina Software (UK) Limited. - * Copyright (C) 2004 - 2006 Red Hat, Inc. All rights reserved. - * - * This file is released under the GPL. - */ - -#include "dm.h" - -#include <linux/module.h> -#include <linux/vmalloc.h> -#include <linux/miscdevice.h> -#include <linux/init.h> -#include <linux/wait.h> -#include <linux/slab.h> -#include <linux/dm-ioctl.h> -#include <linux/hdreg.h> -#include <linux/compat.h> - -#include <asm/uaccess.h> - -#define DM_MSG_PREFIX "ioctl" -#define DM_DRIVER_EMAIL "dm-devel@redhat.com" - -/*----------------------------------------------------------------- - * The ioctl interface needs to be able to look up devices by - * name or uuid. - *---------------------------------------------------------------*/ -struct hash_cell { - struct list_head name_list; - struct list_head uuid_list; - - char *name; - char *uuid; - struct mapped_device *md; - struct dm_table *new_map; -}; - -struct vers_iter { - size_t param_size; - struct dm_target_versions *vers, *old_vers; - char *end; - uint32_t flags; -}; - - -#define NUM_BUCKETS 64 -#define MASK_BUCKETS (NUM_BUCKETS - 1) -static struct list_head _name_buckets[NUM_BUCKETS]; -static struct list_head _uuid_buckets[NUM_BUCKETS]; - -static void dm_hash_remove_all(int keep_open_devices); - -/* - * Guards access to both hash tables. - */ -static DECLARE_RWSEM(_hash_lock); - -/* - * Protects use of mdptr to obtain hash cell name and uuid from mapped device. - */ -static DEFINE_MUTEX(dm_hash_cells_mutex); - -static void init_buckets(struct list_head *buckets) -{ - unsigned int i; - - for (i = 0; i < NUM_BUCKETS; i++) - INIT_LIST_HEAD(buckets + i); -} - -static int dm_hash_init(void) -{ - init_buckets(_name_buckets); - init_buckets(_uuid_buckets); - return 0; -} - -static void dm_hash_exit(void) -{ - dm_hash_remove_all(0); -} - -/*----------------------------------------------------------------- - * Hash function: - * We're not really concerned with the str hash function being - * fast since it's only used by the ioctl interface. - *---------------------------------------------------------------*/ -static unsigned int hash_str(const char *str) -{ - const unsigned int hash_mult = 2654435387U; - unsigned int h = 0; - - while (*str) - h = (h + (unsigned int) *str++) * hash_mult; - - return h & MASK_BUCKETS; -} - -/*----------------------------------------------------------------- - * Code for looking up a device by name - *---------------------------------------------------------------*/ -static struct hash_cell *__get_name_cell(const char *str) -{ - struct hash_cell *hc; - unsigned int h = hash_str(str); - - list_for_each_entry (hc, _name_buckets + h, name_list) - if (!strcmp(hc->name, str)) { - dm_get(hc->md); - return hc; - } - - return NULL; -} - -static struct hash_cell *__get_uuid_cell(const char *str) -{ - struct hash_cell *hc; - unsigned int h = hash_str(str); - - list_for_each_entry (hc, _uuid_buckets + h, uuid_list) - if (!strcmp(hc->uuid, str)) { - dm_get(hc->md); - return hc; - } - - return NULL; -} - -static struct hash_cell *__get_dev_cell(uint64_t dev) -{ - struct mapped_device *md; - struct hash_cell *hc; - - md = dm_get_md(huge_decode_dev(dev)); - if (!md) - return NULL; - - hc = dm_get_mdptr(md); - if (!hc) { - dm_put(md); - return NULL; - } - - return hc; -} - -/*----------------------------------------------------------------- - * Inserting, removing and renaming a device. - *---------------------------------------------------------------*/ -static struct hash_cell *alloc_cell(const char *name, const char *uuid, - struct mapped_device *md) -{ - struct hash_cell *hc; - - hc = kmalloc(sizeof(*hc), GFP_KERNEL); - if (!hc) - return NULL; - - hc->name = kstrdup(name, GFP_KERNEL); - if (!hc->name) { - kfree(hc); - return NULL; - } - - if (!uuid) - hc->uuid = NULL; - - else { - hc->uuid = kstrdup(uuid, GFP_KERNEL); - if (!hc->uuid) { - kfree(hc->name); - kfree(hc); - return NULL; - } - } - - INIT_LIST_HEAD(&hc->name_list); - INIT_LIST_HEAD(&hc->uuid_list); - hc->md = md; - hc->new_map = NULL; - return hc; -} - -static void free_cell(struct hash_cell *hc) -{ - if (hc) { - kfree(hc->name); - kfree(hc->uuid); - kfree(hc); - } -} - -/* - * The kdev_t and uuid of a device can never change once it is - * initially inserted. - */ -static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md) -{ - struct hash_cell *cell, *hc; - - /* - * Allocate the new cells. - */ - cell = alloc_cell(name, uuid, md); - if (!cell) - return -ENOMEM; - - /* - * Insert the cell into both hash tables. - */ - down_write(&_hash_lock); - 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) { - 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)); - } - dm_get(md); - mutex_lock(&dm_hash_cells_mutex); - dm_set_mdptr(md, cell); - mutex_unlock(&dm_hash_cells_mutex); - up_write(&_hash_lock); - - return 0; - - bad: - up_write(&_hash_lock); - free_cell(cell); - return -EBUSY; -} - -static void __hash_remove(struct hash_cell *hc) -{ - struct dm_table *table; - - /* remove from the dev hash */ - list_del(&hc->uuid_list); - list_del(&hc->name_list); - mutex_lock(&dm_hash_cells_mutex); - dm_set_mdptr(hc->md, NULL); - mutex_unlock(&dm_hash_cells_mutex); - - table = dm_get_live_table(hc->md); - if (table) { - dm_table_event(table); - dm_table_put(table); - } - - if (hc->new_map) - dm_table_destroy(hc->new_map); - dm_put(hc->md); - free_cell(hc); -} - -static void dm_hash_remove_all(int keep_open_devices) -{ - int i, dev_skipped; - struct hash_cell *hc; - struct mapped_device *md; - -retry: - dev_skipped = 0; - - down_write(&_hash_lock); - - for (i = 0; i < NUM_BUCKETS; i++) { - list_for_each_entry(hc, _name_buckets + i, name_list) { - md = hc->md; - dm_get(md); - - if (keep_open_devices && dm_lock_for_deletion(md)) { - dm_put(md); - dev_skipped++; - continue; - } - - __hash_remove(hc); - - up_write(&_hash_lock); - - dm_put(md); - if (likely(keep_open_devices)) - dm_destroy(md); - else - dm_destroy_immediate(md); - - /* - * Some mapped devices may be using other mapped - * devices, so repeat until we make no further - * progress. If a new mapped device is created - * here it will also get removed. - */ - goto retry; - } - } - - up_write(&_hash_lock); - - if (dev_skipped) - DMWARN("remove_all left %d open device(s)", dev_skipped); -} - -/* - * Set the uuid of a hash_cell that isn't already set. - */ -static void __set_cell_uuid(struct hash_cell *hc, char *new_uuid) -{ - mutex_lock(&dm_hash_cells_mutex); - hc->uuid = new_uuid; - mutex_unlock(&dm_hash_cells_mutex); - - list_add(&hc->uuid_list, _uuid_buckets + hash_str(new_uuid)); -} - -/* - * Changes the name of a hash_cell and returns the old name for - * the caller to free. - */ -static char *__change_cell_name(struct hash_cell *hc, char *new_name) -{ - char *old_name; - - /* - * Rename and move the name cell. - */ - list_del(&hc->name_list); - old_name = hc->name; - - mutex_lock(&dm_hash_cells_mutex); - hc->name = new_name; - mutex_unlock(&dm_hash_cells_mutex); - - list_add(&hc->name_list, _name_buckets + hash_str(new_name)); - - return old_name; -} - -static struct mapped_device *dm_hash_rename(struct dm_ioctl *param, - const char *new) -{ - char *new_data, *old_name = NULL; - struct hash_cell *hc; - struct dm_table *table; - struct mapped_device *md; - unsigned change_uuid = (param->flags & DM_UUID_FLAG) ? 1 : 0; - - /* - * duplicate new. - */ - new_data = kstrdup(new, GFP_KERNEL); - if (!new_data) - return ERR_PTR(-ENOMEM); - - down_write(&_hash_lock); - - /* - * Is new free ? - */ - if (change_uuid) - hc = __get_uuid_cell(new); - else - hc = __get_name_cell(new); - - if (hc) { - DMWARN("Unable to change %s on mapped device %s to one that " - "already exists: %s", - change_uuid ? "uuid" : "name", - param->name, new); - dm_put(hc->md); - up_write(&_hash_lock); - kfree(new_data); - return ERR_PTR(-EBUSY); - } - - /* - * Is there such a device as 'old' ? - */ - hc = __get_name_cell(param->name); - if (!hc) { - DMWARN("Unable to rename non-existent device, %s to %s%s", - param->name, change_uuid ? "uuid " : "", new); - up_write(&_hash_lock); - kfree(new_data); - return ERR_PTR(-ENXIO); - } - - /* - * Does this device already have a uuid? - */ - if (change_uuid && hc->uuid) { - DMWARN("Unable to change uuid of mapped device %s to %s " - "because uuid is already set to %s", - param->name, new, hc->uuid); - dm_put(hc->md); - up_write(&_hash_lock); - kfree(new_data); - return ERR_PTR(-EINVAL); - } - - if (change_uuid) - __set_cell_uuid(hc, new_data); - else - old_name = __change_cell_name(hc, new_data); - - /* - * Wake up any dm event waiters. - */ - table = dm_get_live_table(hc->md); - if (table) { - dm_table_event(table); - dm_table_put(table); - } - - if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, param->event_nr)) - param->flags |= DM_UEVENT_GENERATED_FLAG; - - md = hc->md; - up_write(&_hash_lock); - kfree(old_name); - - return md; -} - -/*----------------------------------------------------------------- - * Implementation of the ioctl commands - *---------------------------------------------------------------*/ -/* - * All the ioctl commands get dispatched to functions with this - * prototype. - */ -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(1); - param->data_size = 0; - return 0; -} - -/* - * Round up the ptr to an 8-byte boundary. - */ -#define ALIGN_MASK 7 -static inline void *align_ptr(void *ptr) -{ - return (void *) (((size_t) (ptr + ALIGN_MASK)) & ~ALIGN_MASK); -} - -/* - * Retrieves the data payload buffer from an already allocated - * struct dm_ioctl. - */ -static void *get_result_buffer(struct dm_ioctl *param, size_t param_size, - size_t *len) -{ - param->data_start = align_ptr(param + 1) - (void *) param; - - if (param->data_start < param_size) - *len = param_size - param->data_start; - else - *len = 0; - - return ((void *) param) + param->data_start; -} - -static int list_devices(struct dm_ioctl *param, size_t param_size) -{ - unsigned int i; - struct hash_cell *hc; - size_t len, needed = 0; - struct gendisk *disk; - struct dm_name_list *nl, *old_nl = NULL; - - down_write(&_hash_lock); - - /* - * Loop through all the devices working out how much - * space we need. - */ - for (i = 0; i < NUM_BUCKETS; i++) { - list_for_each_entry (hc, _name_buckets + i, name_list) { - needed += sizeof(struct dm_name_list); - needed += strlen(hc->name) + 1; - needed += ALIGN_MASK; - } - } - - /* - * Grab our output buffer. - */ - nl = get_result_buffer(param, param_size, &len); - if (len < needed) { - param->flags |= DM_BUFFER_FULL_FLAG; - goto out; - } - param->data_size = param->data_start + needed; - - nl->dev = 0; /* Flags no data */ - - /* - * Now loop through filling out the names. - */ - for (i = 0; i < NUM_BUCKETS; i++) { - list_for_each_entry (hc, _name_buckets + i, name_list) { - if (old_nl) - old_nl->next = (uint32_t) ((void *) nl - - (void *) old_nl); - disk = dm_disk(hc->md); - nl->dev = huge_encode_dev(disk_devt(disk)); - nl->next = 0; - strcpy(nl->name, hc->name); - - old_nl = nl; - nl = align_ptr(((void *) ++nl) + strlen(hc->name) + 1); - } - } - - out: - up_write(&_hash_lock); - return 0; -} - -static void list_version_get_needed(struct target_type *tt, void *needed_param) -{ - size_t *needed = needed_param; - - *needed += sizeof(struct dm_target_versions); - *needed += strlen(tt->name); - *needed += ALIGN_MASK; -} - -static void list_version_get_info(struct target_type *tt, void *param) -{ - struct vers_iter *info = param; - - /* Check space - it might have changed since the first iteration */ - if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 > - info->end) { - - info->flags = DM_BUFFER_FULL_FLAG; - return; - } - - if (info->old_vers) - info->old_vers->next = (uint32_t) ((void *)info->vers - - (void *)info->old_vers); - info->vers->version[0] = tt->version[0]; - info->vers->version[1] = tt->version[1]; - info->vers->version[2] = tt->version[2]; - info->vers->next = 0; - strcpy(info->vers->name, tt->name); - - info->old_vers = info->vers; - info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1); -} - -static int list_versions(struct dm_ioctl *param, size_t param_size) -{ - size_t len, needed = 0; - struct dm_target_versions *vers; - struct vers_iter iter_info; - - /* - * Loop through all the devices working out how much - * space we need. - */ - dm_target_iterate(list_version_get_needed, &needed); - - /* - * Grab our output buffer. - */ - vers = get_result_buffer(param, param_size, &len); - if (len < needed) { - param->flags |= DM_BUFFER_FULL_FLAG; - goto out; - } - param->data_size = param->data_start + needed; - - iter_info.param_size = param_size; - iter_info.old_vers = NULL; - iter_info.vers = vers; - iter_info.flags = 0; - iter_info.end = (char *)vers+len; - - /* - * Now loop through filling out the names & versions. - */ - dm_target_iterate(list_version_get_info, &iter_info); - param->flags |= iter_info.flags; - - out: - return 0; -} - -static int check_name(const char *name) -{ - if (strchr(name, '/')) { - DMWARN("invalid device name"); - return -EINVAL; - } - - return 0; -} - -/* - * On successful return, the caller must not attempt to acquire - * _hash_lock without first calling dm_table_put, because dm_table_destroy - * waits for this dm_table_put and could be called under this lock. - */ -static struct dm_table *dm_get_inactive_table(struct mapped_device *md) -{ - struct hash_cell *hc; - struct dm_table *table = NULL; - - down_read(&_hash_lock); - hc = dm_get_mdptr(md); - if (!hc || hc->md != md) { - DMWARN("device has been removed from the dev hash table."); - goto out; - } - - table = hc->new_map; - if (table) - dm_table_get(table); - -out: - up_read(&_hash_lock); - - return table; -} - -static struct dm_table *dm_get_live_or_inactive_table(struct mapped_device *md, - struct dm_ioctl *param) -{ - return (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) ? - dm_get_inactive_table(md) : dm_get_live_table(md); -} - -/* - * Fills in a dm_ioctl structure, ready for sending back to - * userland. - */ -static void __dev_status(struct mapped_device *md, struct dm_ioctl *param) -{ - struct gendisk *disk = dm_disk(md); - struct dm_table *table; - - param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | - DM_ACTIVE_PRESENT_FLAG); - - if (dm_suspended_md(md)) - param->flags |= DM_SUSPEND_FLAG; - - param->dev = huge_encode_dev(disk_devt(disk)); - - /* - * 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); - - param->event_nr = dm_get_event_nr(md); - param->target_count = 0; - - table = dm_get_live_table(md); - if (table) { - if (!(param->flags & DM_QUERY_INACTIVE_TABLE_FLAG)) { - if (get_disk_ro(disk)) - param->flags |= DM_READONLY_FLAG; - param->target_count = dm_table_get_num_targets(table); - } - dm_table_put(table); - - param->flags |= DM_ACTIVE_PRESENT_FLAG; - } - - if (param->flags & DM_QUERY_INACTIVE_TABLE_FLAG) { - table = dm_get_inactive_table(md); - if (table) { - if (!(dm_table_get_mode(table) & FMODE_WRITE)) - param->flags |= DM_READONLY_FLAG; - param->target_count = dm_table_get_num_targets(table); - dm_table_put(table); - } - } -} - -static int dev_create(struct dm_ioctl *param, size_t param_size) -{ - int r, m = DM_ANY_MINOR; - struct mapped_device *md; - - r = check_name(param->name); - if (r) - return r; - - if (param->flags & DM_PERSISTENT_DEV_FLAG) - m = MINOR(huge_decode_dev(param->dev)); - - r = dm_create(m, &md); - if (r) - return r; - - r = dm_hash_insert(param->name, *param->uuid ? param->uuid : NULL, md); - if (r) { - dm_put(md); - dm_destroy(md); - return r; - } - - param->flags &= ~DM_INACTIVE_PRESENT_FLAG; - - __dev_status(md, param); - - dm_put(md); - - return 0; -} - -/* - * Always use UUID for lookups if it's present, otherwise use name or dev. - */ -static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param) -{ - struct hash_cell *hc = NULL; - - if (*param->uuid) { - if (*param->name || param->dev) - return NULL; - - hc = __get_uuid_cell(param->uuid); - if (!hc) - return NULL; - } else if (*param->name) { - if (param->dev) - return NULL; - - hc = __get_name_cell(param->name); - if (!hc) - return NULL; - } else if (param->dev) { - hc = __get_dev_cell(param->dev); - if (!hc) - return NULL; - } else - return NULL; - - /* - * Sneakily write in both the name and the uuid - * while we have the cell. - */ - strlcpy(param->name, hc->name, sizeof(param->name)); - if (hc->uuid) - strlcpy(param->uuid, hc->uuid, sizeof(param->uuid)); - else - param->uuid[0] = '\0'; - - if (hc->new_map) - param->flags |= DM_INACTIVE_PRESENT_FLAG; - else - param->flags &= ~DM_INACTIVE_PRESENT_FLAG; - - return hc; -} - -static struct mapped_device *find_device(struct dm_ioctl *param) -{ - struct hash_cell *hc; - struct mapped_device *md = NULL; - - down_read(&_hash_lock); - hc = __find_device_hash_cell(param); - if (hc) - md = hc->md; - up_read(&_hash_lock); - - return md; -} - -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); - - if (!hc) { - DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); - up_write(&_hash_lock); - 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) { - DMDEBUG_LIMIT("unable to remove open device %s", hc->name); - up_write(&_hash_lock); - dm_put(md); - return r; - } - - __hash_remove(hc); - up_write(&_hash_lock); - - if (!dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr)) - param->flags |= DM_UEVENT_GENERATED_FLAG; - - dm_put(md); - dm_destroy(md); - return 0; -} - -/* - * Check a string doesn't overrun the chunk of - * memory we copied from userland. - */ -static int invalid_str(char *str, void *end) -{ - while ((void *) str < end) - if (!*str++) - return 0; - - return -EINVAL; -} - -static int dev_rename(struct dm_ioctl *param, size_t param_size) -{ - int r; - char *new_data = (char *) param + param->data_start; - struct mapped_device *md; - unsigned change_uuid = (param->flags & DM_UUID_FLAG) ? 1 : 0; - - if (new_data < param->data || - invalid_str(new_data, (void *) param + param_size) || - strlen(new_data) > (change_uuid ? DM_UUID_LEN - 1 : DM_NAME_LEN - 1)) { - DMWARN("Invalid new mapped device name or uuid string supplied."); - return -EINVAL; - } - - if (!change_uuid) { - r = check_name(new_data); - if (r) - return r; - } - - md = dm_hash_rename(param, new_data); - if (IS_ERR(md)) - return PTR_ERR(md); - - __dev_status(md, param); - dm_put(md); - - return 0; -} - -static int dev_set_geometry(struct dm_ioctl *param, size_t param_size) -{ - int r = -EINVAL, x; - struct mapped_device *md; - struct hd_geometry geometry; - unsigned long indata[4]; - char *geostr = (char *) param + param->data_start; - char dummy; - - md = find_device(param); - if (!md) - return -ENXIO; - - if (geostr < param->data || - invalid_str(geostr, (void *) param + param_size)) { - DMWARN("Invalid geometry supplied."); - goto out; - } - - x = sscanf(geostr, "%lu %lu %lu %lu%c", indata, - indata + 1, indata + 2, indata + 3, &dummy); - - if (x != 4) { - DMWARN("Unable to interpret geometry settings."); - goto out; - } - - if (indata[0] > 65535 || indata[1] > 255 || - indata[2] > 255 || indata[3] > ULONG_MAX) { - DMWARN("Geometry exceeds range limits."); - goto out; - } - - geometry.cylinders = indata[0]; - geometry.heads = indata[1]; - geometry.sectors = indata[2]; - geometry.start = indata[3]; - - r = dm_set_geometry(md, &geometry); - - param->data_size = 0; - -out: - dm_put(md); - return r; -} - -static int do_suspend(struct dm_ioctl *param) -{ - int r = 0; - unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; - struct mapped_device *md; - - md = find_device(param); - if (!md) - return -ENXIO; - - if (param->flags & DM_SKIP_LOCKFS_FLAG) - suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; - if (param->flags & DM_NOFLUSH_FLAG) - suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; - - if (!dm_suspended_md(md)) { - r = dm_suspend(md, suspend_flags); - if (r) - goto out; - } - - __dev_status(md, param); - -out: - dm_put(md); - - return r; -} - -static int do_resume(struct dm_ioctl *param) -{ - int r = 0; - unsigned suspend_flags = DM_SUSPEND_LOCKFS_FLAG; - struct hash_cell *hc; - struct mapped_device *md; - struct dm_table *new_map, *old_map = NULL; - - down_write(&_hash_lock); - - hc = __find_device_hash_cell(param); - if (!hc) { - DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); - up_write(&_hash_lock); - return -ENXIO; - } - - md = hc->md; - - new_map = hc->new_map; - hc->new_map = NULL; - param->flags &= ~DM_INACTIVE_PRESENT_FLAG; - - up_write(&_hash_lock); - - /* Do we need to load a new map ? */ - if (new_map) { - /* Suspend if it isn't already suspended */ - if (param->flags & DM_SKIP_LOCKFS_FLAG) - suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG; - if (param->flags & DM_NOFLUSH_FLAG) - suspend_flags |= DM_SUSPEND_NOFLUSH_FLAG; - if (!dm_suspended_md(md)) - dm_suspend(md, suspend_flags); - - old_map = dm_swap_table(md, new_map); - if (IS_ERR(old_map)) { - dm_table_destroy(new_map); - dm_put(md); - return PTR_ERR(old_map); - } - - if (dm_table_get_mode(new_map) & FMODE_WRITE) - set_disk_ro(dm_disk(md), 0); - else - set_disk_ro(dm_disk(md), 1); - } - - if (dm_suspended_md(md)) { - r = dm_resume(md); - if (!r && !dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr)) - param->flags |= DM_UEVENT_GENERATED_FLAG; - } - - if (old_map) - dm_table_destroy(old_map); - - if (!r) - __dev_status(md, param); - - dm_put(md); - return r; -} - -/* - * Set or unset the suspension state of a device. - * If the device already is in the requested state we just return its status. - */ -static int dev_suspend(struct dm_ioctl *param, size_t param_size) -{ - if (param->flags & DM_SUSPEND_FLAG) - return do_suspend(param); - - return do_resume(param); -} - -/* - * Copies device info back to user space, used by - * the create and info ioctls. - */ -static int dev_status(struct dm_ioctl *param, size_t param_size) -{ - struct mapped_device *md; - - md = find_device(param); - if (!md) - return -ENXIO; - - __dev_status(md, param); - dm_put(md); - - return 0; -} - -/* - * Build up the status struct for each target - */ -static void retrieve_status(struct dm_table *table, - struct dm_ioctl *param, size_t param_size) -{ - unsigned int i, num_targets; - struct dm_target_spec *spec; - char *outbuf, *outptr; - status_type_t type; - size_t remaining, len, used = 0; - - outptr = outbuf = get_result_buffer(param, param_size, &len); - - if (param->flags & DM_STATUS_TABLE_FLAG) - type = STATUSTYPE_TABLE; - else - type = STATUSTYPE_INFO; - - /* Get all the target info */ - num_targets = dm_table_get_num_targets(table); - for (i = 0; i < num_targets; i++) { - struct dm_target *ti = dm_table_get_target(table, i); - - remaining = len - (outptr - outbuf); - if (remaining <= sizeof(struct dm_target_spec)) { - param->flags |= DM_BUFFER_FULL_FLAG; - break; - } - - spec = (struct dm_target_spec *) outptr; - - spec->status = 0; - spec->sector_start = ti->begin; - spec->length = ti->len; - strncpy(spec->target_type, ti->type->name, - sizeof(spec->target_type)); - - outptr += sizeof(struct dm_target_spec); - remaining = len - (outptr - outbuf); - if (remaining <= 0) { - param->flags |= DM_BUFFER_FULL_FLAG; - break; - } - - /* Get the status/table string from the target driver */ - if (ti->type->status) { - if (ti->type->status(ti, type, outptr, remaining)) { - param->flags |= DM_BUFFER_FULL_FLAG; - break; - } - } else - outptr[0] = '\0'; - - outptr += strlen(outptr) + 1; - used = param->data_start + (outptr - outbuf); - - outptr = align_ptr(outptr); - spec->next = outptr - outbuf; - } - - if (used) - param->data_size = used; - - param->target_count = num_targets; -} - -/* - * Wait for a device to report an event - */ -static int dev_wait(struct dm_ioctl *param, size_t param_size) -{ - int r = 0; - struct mapped_device *md; - struct dm_table *table; - - md = find_device(param); - if (!md) - return -ENXIO; - - /* - * Wait for a notification event - */ - if (dm_wait_event(md, param->event_nr)) { - r = -ERESTARTSYS; - goto out; - } - - /* - * The userland program is going to want to know what - * changed to trigger the event, so we may as well tell - * him and save an ioctl. - */ - __dev_status(md, param); - - table = dm_get_live_or_inactive_table(md, param); - if (table) { - retrieve_status(table, param, param_size); - dm_table_put(table); - } - -out: - dm_put(md); - - return r; -} - -static inline fmode_t get_mode(struct dm_ioctl *param) -{ - fmode_t mode = FMODE_READ | FMODE_WRITE; - - if (param->flags & DM_READONLY_FLAG) - mode = FMODE_READ; - - return mode; -} - -static int next_target(struct dm_target_spec *last, uint32_t next, void *end, - struct dm_target_spec **spec, char **target_params) -{ - *spec = (struct dm_target_spec *) ((unsigned char *) last + next); - *target_params = (char *) (*spec + 1); - - if (*spec < (last + 1)) - return -EINVAL; - - return invalid_str(*target_params, end); -} - -static int populate_table(struct dm_table *table, - struct dm_ioctl *param, size_t param_size) -{ - int r; - unsigned int i = 0; - struct dm_target_spec *spec = (struct dm_target_spec *) param; - uint32_t next = param->data_start; - void *end = (void *) param + param_size; - char *target_params; - - if (!param->target_count) { - DMWARN("populate_table: no targets specified"); - return -EINVAL; - } - - for (i = 0; i < param->target_count; i++) { - - r = next_target(spec, next, end, &spec, &target_params); - if (r) { - DMWARN("unable to find target"); - return r; - } - - r = dm_table_add_target(table, spec->target_type, - (sector_t) spec->sector_start, - (sector_t) spec->length, - target_params); - if (r) { - DMWARN("error adding target to table"); - return r; - } - - next = spec->next; - } - - return dm_table_complete(table); -} - -static int table_load(struct dm_ioctl *param, size_t param_size) -{ - int r; - struct hash_cell *hc; - struct dm_table *t; - struct mapped_device *md; - struct target_type *immutable_target_type; - - md = find_device(param); - if (!md) - return -ENXIO; - - r = dm_table_create(&t, get_mode(param), param->target_count, md); - if (r) - goto out; - - r = populate_table(t, param, param_size); - if (r) { - dm_table_destroy(t); - goto out; - } - - immutable_target_type = dm_get_immutable_target_type(md); - if (immutable_target_type && - (immutable_target_type != dm_table_get_immutable_target_type(t))) { - DMWARN("can't replace immutable target type %s", - immutable_target_type->name); - dm_table_destroy(t); - r = -EINVAL; - goto out; - } - - /* Protect md->type and md->queue against concurrent table loads. */ - dm_lock_md_type(md); - if (dm_get_md_type(md) == DM_TYPE_NONE) - /* Initial table load: acquire type of table. */ - dm_set_md_type(md, dm_table_get_type(t)); - else if (dm_get_md_type(md) != dm_table_get_type(t)) { - DMWARN("can't change device type after initial table load."); - dm_table_destroy(t); - dm_unlock_md_type(md); - r = -EINVAL; - goto out; - } - - /* setup md->queue to reflect md's type (may block) */ - r = dm_setup_md_queue(md); - if (r) { - DMWARN("unable to set up device queue for new table."); - dm_table_destroy(t); - dm_unlock_md_type(md); - goto out; - } - dm_unlock_md_type(md); - - /* stage inactive table */ - down_write(&_hash_lock); - hc = dm_get_mdptr(md); - if (!hc || hc->md != md) { - DMWARN("device has been removed from the dev hash table."); - dm_table_destroy(t); - up_write(&_hash_lock); - r = -ENXIO; - goto out; - } - - if (hc->new_map) - dm_table_destroy(hc->new_map); - hc->new_map = t; - up_write(&_hash_lock); - - param->flags |= DM_INACTIVE_PRESENT_FLAG; - __dev_status(md, param); - -out: - dm_put(md); - - return r; -} - -static int table_clear(struct dm_ioctl *param, size_t param_size) -{ - struct hash_cell *hc; - struct mapped_device *md; - - down_write(&_hash_lock); - - hc = __find_device_hash_cell(param); - if (!hc) { - DMDEBUG_LIMIT("device doesn't appear to be in the dev hash table."); - up_write(&_hash_lock); - return -ENXIO; - } - - if (hc->new_map) { - dm_table_destroy(hc->new_map); - hc->new_map = NULL; - } - - param->flags &= ~DM_INACTIVE_PRESENT_FLAG; - - __dev_status(hc->md, param); - md = hc->md; - up_write(&_hash_lock); - dm_put(md); - - return 0; -} - -/* - * Retrieves a list of devices used by a particular dm device. - */ -static void retrieve_deps(struct dm_table *table, - struct dm_ioctl *param, size_t param_size) -{ - unsigned int count = 0; - struct list_head *tmp; - size_t len, needed; - struct dm_dev_internal *dd; - struct dm_target_deps *deps; - - deps = get_result_buffer(param, param_size, &len); - - /* - * Count the devices. - */ - list_for_each (tmp, dm_table_get_devices(table)) - count++; - - /* - * Check we have enough space. - */ - needed = sizeof(*deps) + (sizeof(*deps->dev) * count); - if (len < needed) { - param->flags |= DM_BUFFER_FULL_FLAG; - return; - } - - /* - * Fill in the devices. - */ - deps->count = count; - count = 0; - list_for_each_entry (dd, dm_table_get_devices(table), list) - deps->dev[count++] = huge_encode_dev(dd->dm_dev.bdev->bd_dev); - - param->data_size = param->data_start + needed; -} - -static int table_deps(struct dm_ioctl *param, size_t param_size) -{ - struct mapped_device *md; - struct dm_table *table; - - md = find_device(param); - if (!md) - return -ENXIO; - - __dev_status(md, param); - - table = dm_get_live_or_inactive_table(md, param); - if (table) { - retrieve_deps(table, param, param_size); - dm_table_put(table); - } - - dm_put(md); - - return 0; -} - -/* - * Return the status of a device as a text string for each - * target. - */ -static int table_status(struct dm_ioctl *param, size_t param_size) -{ - struct mapped_device *md; - struct dm_table *table; - - md = find_device(param); - if (!md) - return -ENXIO; - - __dev_status(md, param); - - table = dm_get_live_or_inactive_table(md, param); - if (table) { - retrieve_status(table, param, param_size); - dm_table_put(table); - } - - dm_put(md); - - return 0; -} - -/* - * Pass a message to the target that's at the supplied device offset. - */ -static int target_message(struct dm_ioctl *param, size_t param_size) -{ - int r, argc; - char **argv; - struct mapped_device *md; - struct dm_table *table; - struct dm_target *ti; - struct dm_target_msg *tmsg = (void *) param + param->data_start; - - md = find_device(param); - if (!md) - return -ENXIO; - - if (tmsg < (struct dm_target_msg *) param->data || - invalid_str(tmsg->message, (void *) param + param_size)) { - DMWARN("Invalid target message parameters."); - r = -EINVAL; - goto out; - } - - r = dm_split_args(&argc, &argv, tmsg->message); - if (r) { - DMWARN("Failed to split target message parameters"); - goto out; - } - - if (!argc) { - DMWARN("Empty message received."); - goto out_argv; - } - - table = dm_get_live_table(md); - if (!table) - goto out_argv; - - if (dm_deleting_md(md)) { - r = -ENXIO; - goto out_table; - } - - ti = dm_table_find_target(table, tmsg->sector); - if (!dm_target_is_valid(ti)) { - DMWARN("Target message sector outside device."); - r = -EINVAL; - } else if (ti->type->message) - r = ti->type->message(ti, argc, argv); - else { - DMWARN("Target type does not support messages"); - r = -EINVAL; - } - - out_table: - dm_table_put(table); - out_argv: - kfree(argv); - out: - param->data_size = 0; - dm_put(md); - return r; -} - -/*----------------------------------------------------------------- - * Implementation of open/close/ioctl on the special char - * device. - *---------------------------------------------------------------*/ -static ioctl_fn lookup_ioctl(unsigned int cmd) -{ - static struct { - int cmd; - ioctl_fn fn; - } _ioctls[] = { - {DM_VERSION_CMD, NULL}, /* version is dealt with elsewhere */ - {DM_REMOVE_ALL_CMD, remove_all}, - {DM_LIST_DEVICES_CMD, list_devices}, - - {DM_DEV_CREATE_CMD, dev_create}, - {DM_DEV_REMOVE_CMD, dev_remove}, - {DM_DEV_RENAME_CMD, dev_rename}, - {DM_DEV_SUSPEND_CMD, dev_suspend}, - {DM_DEV_STATUS_CMD, dev_status}, - {DM_DEV_WAIT_CMD, dev_wait}, - - {DM_TABLE_LOAD_CMD, table_load}, - {DM_TABLE_CLEAR_CMD, table_clear}, - {DM_TABLE_DEPS_CMD, table_deps}, - {DM_TABLE_STATUS_CMD, table_status}, - - {DM_LIST_VERSIONS_CMD, list_versions}, - - {DM_TARGET_MSG_CMD, target_message}, - {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry} - }; - - return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn; -} - -/* - * As well as checking the version compatibility this always - * copies the kernel interface version out. - */ -static int check_version(unsigned int cmd, struct dm_ioctl __user *user) -{ - uint32_t version[3]; - int r = 0; - - if (copy_from_user(version, user->version, sizeof(version))) - return -EFAULT; - - if ((DM_VERSION_MAJOR != version[0]) || - (DM_VERSION_MINOR < version[1])) { - DMWARN("ioctl interface mismatch: " - "kernel(%u.%u.%u), user(%u.%u.%u), cmd(%d)", - DM_VERSION_MAJOR, DM_VERSION_MINOR, - DM_VERSION_PATCHLEVEL, - version[0], version[1], version[2], cmd); - r = -EINVAL; - } - - /* - * Fill in the kernel version. - */ - version[0] = DM_VERSION_MAJOR; - version[1] = DM_VERSION_MINOR; - version[2] = DM_VERSION_PATCHLEVEL; - if (copy_to_user(user->version, version, sizeof(version))) - return -EFAULT; - - return r; -} - -static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl **param) -{ - struct dm_ioctl tmp, *dmi; - int secure_data; - - if (copy_from_user(&tmp, user, sizeof(tmp) - sizeof(tmp.data))) - return -EFAULT; - - if (tmp.data_size < (sizeof(tmp) - sizeof(tmp.data))) - return -EINVAL; - - secure_data = tmp.flags & DM_SECURE_DATA_FLAG; - - dmi = vmalloc(tmp.data_size); - if (!dmi) { - if (secure_data && clear_user(user, tmp.data_size)) - return -EFAULT; - return -ENOMEM; - } - - if (copy_from_user(dmi, user, tmp.data_size)) - goto bad; - - /* Wipe the user buffer so we do not return it to userspace */ - if (secure_data && clear_user(user, tmp.data_size)) - goto bad; - - *param = dmi; - return 0; - -bad: - if (secure_data) - memset(dmi, 0, tmp.data_size); - vfree(dmi); - return -EFAULT; -} - -static int validate_params(uint cmd, struct dm_ioctl *param) -{ - /* Always clear this flag */ - param->flags &= ~DM_BUFFER_FULL_FLAG; - param->flags &= ~DM_UEVENT_GENERATED_FLAG; - param->flags &= ~DM_SECURE_DATA_FLAG; - - /* Ignores parameters */ - if (cmd == DM_REMOVE_ALL_CMD || - cmd == DM_LIST_DEVICES_CMD || - cmd == DM_LIST_VERSIONS_CMD) - return 0; - - if ((cmd == DM_DEV_CREATE_CMD)) { - if (!*param->name) { - DMWARN("name not supplied when creating device"); - return -EINVAL; - } - } else if ((*param->uuid && *param->name)) { - DMWARN("only supply one of name or uuid, cmd(%u)", cmd); - return -EINVAL; - } - - /* Ensure strings are terminated */ - param->name[DM_NAME_LEN - 1] = '\0'; - param->uuid[DM_UUID_LEN - 1] = '\0'; - - return 0; -} - -static int ctl_ioctl(uint command, struct dm_ioctl __user *user) -{ - int r = 0; - int wipe_buffer; - unsigned int cmd; - struct dm_ioctl *uninitialized_var(param); - ioctl_fn fn = NULL; - size_t input_param_size; - - /* only root can play with this */ - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - - if (_IOC_TYPE(command) != DM_IOCTL) - return -ENOTTY; - - cmd = _IOC_NR(command); - - /* - * Check the interface version passed in. This also - * writes out the kernel's interface version. - */ - r = check_version(cmd, user); - if (r) - return r; - - /* - * Nothing more to do for the version command. - */ - if (cmd == DM_VERSION_CMD) - return 0; - - fn = lookup_ioctl(cmd); - if (!fn) { - DMWARN("dm_ctl_ioctl: unknown command 0x%x", command); - return -ENOTTY; - } - - /* - * Trying to avoid low memory issues when a device is - * suspended. - */ - current->flags |= PF_MEMALLOC; - - /* - * Copy the parameters into kernel space. - */ - r = copy_params(user, ¶m); - - current->flags &= ~PF_MEMALLOC; - - if (r) - return r; - - input_param_size = param->data_size; - wipe_buffer = param->flags & DM_SECURE_DATA_FLAG; - - r = validate_params(cmd, param); - if (r) - goto out; - - param->data_size = sizeof(*param); - r = fn(param, input_param_size); - - /* - * Copy the results back to userland. - */ - if (!r && copy_to_user(user, param, param->data_size)) - r = -EFAULT; - -out: - if (wipe_buffer) - memset(param, 0, input_param_size); - - vfree(param); - return r; -} - -static long dm_ctl_ioctl(struct file *file, uint command, ulong u) -{ - return (long)ctl_ioctl(command, (struct dm_ioctl __user *)u); -} - -#ifdef CONFIG_COMPAT -static long dm_compat_ctl_ioctl(struct file *file, uint command, ulong u) -{ - return (long)dm_ctl_ioctl(file, command, (ulong) compat_ptr(u)); -} -#else -#define dm_compat_ctl_ioctl NULL -#endif - -static const struct file_operations _ctl_fops = { - .open = nonseekable_open, - .unlocked_ioctl = dm_ctl_ioctl, - .compat_ioctl = dm_compat_ctl_ioctl, - .owner = THIS_MODULE, - .llseek = noop_llseek, -}; - -static struct miscdevice _dm_misc = { - .minor = MAPPER_CTRL_MINOR, - .name = DM_NAME, - .nodename = DM_DIR "/" DM_CONTROL_NODE, - .fops = &_ctl_fops -}; - -MODULE_ALIAS_MISCDEV(MAPPER_CTRL_MINOR); -MODULE_ALIAS("devname:" DM_DIR "/" DM_CONTROL_NODE); - -/* - * Create misc character device and link to DM_DIR/control. - */ -int __init dm_interface_init(void) -{ - int r; - - r = dm_hash_init(); - if (r) - return r; - - r = misc_register(&_dm_misc); - if (r) { - DMERR("misc_register failed for control device"); - dm_hash_exit(); - return r; - } - - DMINFO("%d.%d.%d%s initialised: %s", DM_VERSION_MAJOR, - DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL, DM_VERSION_EXTRA, - DM_DRIVER_EMAIL); - return 0; -} - -void dm_interface_exit(void) -{ - if (misc_deregister(&_dm_misc) < 0) - DMERR("misc_deregister failed for control device"); - - dm_hash_exit(); -} - -/** - * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers - * @md: Pointer to mapped_device - * @name: Buffer (size DM_NAME_LEN) for name - * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined - */ -int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid) -{ - int r = 0; - struct hash_cell *hc; - - if (!md) - return -ENXIO; - - mutex_lock(&dm_hash_cells_mutex); - hc = dm_get_mdptr(md); - if (!hc || hc->md != md) { - r = -ENXIO; - goto out; - } - - if (name) - strcpy(name, hc->name); - if (uuid) - strcpy(uuid, hc->uuid ? : ""); - -out: - mutex_unlock(&dm_hash_cells_mutex); - - return r; -} |