diff options
Diffstat (limited to 'libdde-linux26/libdde_linux26/lib/src/block/genhd.c')
| -rw-r--r-- | libdde-linux26/libdde_linux26/lib/src/block/genhd.c | 1248 |
1 files changed, 0 insertions, 1248 deletions
diff --git a/libdde-linux26/libdde_linux26/lib/src/block/genhd.c b/libdde-linux26/libdde_linux26/lib/src/block/genhd.c deleted file mode 100644 index 921cebff..00000000 --- a/libdde-linux26/libdde_linux26/lib/src/block/genhd.c +++ /dev/null @@ -1,1248 +0,0 @@ -/* - * gendisk handling - */ - -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/genhd.h> -#include <linux/kdev_t.h> -#include <linux/kernel.h> -#include <linux/blkdev.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/proc_fs.h> -#include <linux/seq_file.h> -#include <linux/slab.h> -#include <linux/kmod.h> -#include <linux/kobj_map.h> -#include <linux/buffer_head.h> -#include <linux/mutex.h> -#include <linux/idr.h> - -#include "blk.h" -#ifdef DDE_LINUX -#include "local.h" -#endif - -static DEFINE_MUTEX(block_class_lock); -#ifndef CONFIG_SYSFS_DEPRECATED -struct kobject *block_depr; -#endif - -/* for extended dynamic devt allocation, currently only one major is used */ -#define MAX_EXT_DEVT (1 << MINORBITS) - -/* For extended devt allocation. ext_devt_mutex prevents look up - * results from going away underneath its user. - */ -static DEFINE_MUTEX(ext_devt_mutex); -static DEFINE_IDR(ext_devt_idr); - -static struct device_type disk_type; - -/** - * disk_get_part - get partition - * @disk: disk to look partition from - * @partno: partition number - * - * Look for partition @partno from @disk. If found, increment - * reference count and return it. - * - * CONTEXT: - * Don't care. - * - * RETURNS: - * Pointer to the found partition on success, NULL if not found. - */ -struct hd_struct *disk_get_part(struct gendisk *disk, int partno) -{ - struct hd_struct *part = NULL; - struct disk_part_tbl *ptbl; - - if (unlikely(partno < 0)) - return NULL; - - rcu_read_lock(); - - ptbl = rcu_dereference(disk->part_tbl); - if (likely(partno < ptbl->len)) { - part = rcu_dereference(ptbl->part[partno]); - if (part) - get_device(part_to_dev(part)); - } - - rcu_read_unlock(); - - return part; -} -EXPORT_SYMBOL_GPL(disk_get_part); - -/** - * disk_part_iter_init - initialize partition iterator - * @piter: iterator to initialize - * @disk: disk to iterate over - * @flags: DISK_PITER_* flags - * - * Initialize @piter so that it iterates over partitions of @disk. - * - * CONTEXT: - * Don't care. - */ -void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, - unsigned int flags) -{ - struct disk_part_tbl *ptbl; - - rcu_read_lock(); - ptbl = rcu_dereference(disk->part_tbl); - - piter->disk = disk; - piter->part = NULL; - - if (flags & DISK_PITER_REVERSE) - piter->idx = ptbl->len - 1; - else if (flags & DISK_PITER_INCL_PART0) - piter->idx = 0; - else - piter->idx = 1; - - piter->flags = flags; - - rcu_read_unlock(); -} -EXPORT_SYMBOL_GPL(disk_part_iter_init); - -/** - * disk_part_iter_next - proceed iterator to the next partition and return it - * @piter: iterator of interest - * - * Proceed @piter to the next partition and return it. - * - * CONTEXT: - * Don't care. - */ -struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) -{ - struct disk_part_tbl *ptbl; - int inc, end; - - /* put the last partition */ - disk_put_part(piter->part); - piter->part = NULL; - - /* get part_tbl */ - rcu_read_lock(); - ptbl = rcu_dereference(piter->disk->part_tbl); - - /* determine iteration parameters */ - if (piter->flags & DISK_PITER_REVERSE) { - inc = -1; - if (piter->flags & DISK_PITER_INCL_PART0) - end = -1; - else - end = 0; - } else { - inc = 1; - end = ptbl->len; - } - - /* iterate to the next partition */ - for (; piter->idx != end; piter->idx += inc) { - struct hd_struct *part; - - part = rcu_dereference(ptbl->part[piter->idx]); - if (!part) - continue; - if (!(piter->flags & DISK_PITER_INCL_EMPTY) && !part->nr_sects) - continue; - - get_device(part_to_dev(part)); - piter->part = part; - piter->idx += inc; - break; - } - - rcu_read_unlock(); - - return piter->part; -} -EXPORT_SYMBOL_GPL(disk_part_iter_next); - -/** - * disk_part_iter_exit - finish up partition iteration - * @piter: iter of interest - * - * Called when iteration is over. Cleans up @piter. - * - * CONTEXT: - * Don't care. - */ -void disk_part_iter_exit(struct disk_part_iter *piter) -{ - disk_put_part(piter->part); - piter->part = NULL; -} -EXPORT_SYMBOL_GPL(disk_part_iter_exit); - -static inline int sector_in_part(struct hd_struct *part, sector_t sector) -{ - return part->start_sect <= sector && - sector < part->start_sect + part->nr_sects; -} - -/** - * disk_map_sector_rcu - map sector to partition - * @disk: gendisk of interest - * @sector: sector to map - * - * Find out which partition @sector maps to on @disk. This is - * primarily used for stats accounting. - * - * CONTEXT: - * RCU read locked. The returned partition pointer is valid only - * while preemption is disabled. - * - * RETURNS: - * Found partition on success, part0 is returned if no partition matches - */ -struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) -{ - struct disk_part_tbl *ptbl; - struct hd_struct *part; - int i; - - ptbl = rcu_dereference(disk->part_tbl); - - part = rcu_dereference(ptbl->last_lookup); - if (part && sector_in_part(part, sector)) - return part; - - for (i = 1; i < ptbl->len; i++) { - part = rcu_dereference(ptbl->part[i]); - - if (part && sector_in_part(part, sector)) { - rcu_assign_pointer(ptbl->last_lookup, part); - return part; - } - } - return &disk->part0; -} -EXPORT_SYMBOL_GPL(disk_map_sector_rcu); - -/* - * Can be deleted altogether. Later. - * - */ -static struct blk_major_name { - struct blk_major_name *next; - int major; - char name[16]; -} *major_names[BLKDEV_MAJOR_HASH_SIZE]; - -/* index in the above - for now: assume no multimajor ranges */ -static inline int major_to_index(int major) -{ - return major % BLKDEV_MAJOR_HASH_SIZE; -} - -#ifdef CONFIG_PROC_FS -void blkdev_show(struct seq_file *seqf, off_t offset) -{ - struct blk_major_name *dp; - - if (offset < BLKDEV_MAJOR_HASH_SIZE) { - mutex_lock(&block_class_lock); - for (dp = major_names[offset]; dp; dp = dp->next) - seq_printf(seqf, "%3d %s\n", dp->major, dp->name); - mutex_unlock(&block_class_lock); - } -} -#endif /* CONFIG_PROC_FS */ - -/** - * register_blkdev - register a new block device - * - * @major: the requested major device number [1..255]. If @major=0, try to - * allocate any unused major number. - * @name: the name of the new block device as a zero terminated string - * - * The @name must be unique within the system. - * - * The return value depends on the @major input parameter. - * - if a major device number was requested in range [1..255] then the - * function returns zero on success, or a negative error code - * - if any unused major number was requested with @major=0 parameter - * then the return value is the allocated major number in range - * [1..255] or a negative error code otherwise - */ -int register_blkdev(unsigned int major, const char *name) -{ - struct blk_major_name **n, *p; - int index, ret = 0; - - mutex_lock(&block_class_lock); - - /* temporary */ - if (major == 0) { - for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { - if (major_names[index] == NULL) - break; - } - - if (index == 0) { - printk("register_blkdev: failed to get major for %s\n", - name); - ret = -EBUSY; - goto out; - } - major = index; - ret = major; - } - - p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); - if (p == NULL) { - ret = -ENOMEM; - goto out; - } - - p->major = major; - strlcpy(p->name, name, sizeof(p->name)); - p->next = NULL; - index = major_to_index(major); - - for (n = &major_names[index]; *n; n = &(*n)->next) { - if ((*n)->major == major) - break; - } - if (!*n) - *n = p; - else - ret = -EBUSY; - - if (ret < 0) { - printk("register_blkdev: cannot get major %d for %s\n", - major, name); - kfree(p); - } -out: - mutex_unlock(&block_class_lock); - return ret; -} - -EXPORT_SYMBOL(register_blkdev); - -void unregister_blkdev(unsigned int major, const char *name) -{ - struct blk_major_name **n; - struct blk_major_name *p = NULL; - int index = major_to_index(major); - - mutex_lock(&block_class_lock); - for (n = &major_names[index]; *n; n = &(*n)->next) - if ((*n)->major == major) - break; - if (!*n || strcmp((*n)->name, name)) { - WARN_ON(1); - } else { - p = *n; - *n = p->next; - } - mutex_unlock(&block_class_lock); - kfree(p); -} - -EXPORT_SYMBOL(unregister_blkdev); - -static struct kobj_map *bdev_map; - -/** - * blk_mangle_minor - scatter minor numbers apart - * @minor: minor number to mangle - * - * Scatter consecutively allocated @minor number apart if MANGLE_DEVT - * is enabled. Mangling twice gives the original value. - * - * RETURNS: - * Mangled value. - * - * CONTEXT: - * Don't care. - */ -static int blk_mangle_minor(int minor) -{ -#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT - int i; - - for (i = 0; i < MINORBITS / 2; i++) { - int low = minor & (1 << i); - int high = minor & (1 << (MINORBITS - 1 - i)); - int distance = MINORBITS - 1 - 2 * i; - - minor ^= low | high; /* clear both bits */ - low <<= distance; /* swap the positions */ - high >>= distance; - minor |= low | high; /* and set */ - } -#endif - return minor; -} - -/** - * blk_alloc_devt - allocate a dev_t for a partition - * @part: partition to allocate dev_t for - * @devt: out parameter for resulting dev_t - * - * Allocate a dev_t for block device. - * - * RETURNS: - * 0 on success, allocated dev_t is returned in *@devt. -errno on - * failure. - * - * CONTEXT: - * Might sleep. - */ -int blk_alloc_devt(struct hd_struct *part, dev_t *devt) -{ - struct gendisk *disk = part_to_disk(part); - int idx, rc; - - /* in consecutive minor range? */ - if (part->partno < disk->minors) { - *devt = MKDEV(disk->major, disk->first_minor + part->partno); - return 0; - } - - /* allocate ext devt */ - do { - if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) - return -ENOMEM; - rc = idr_get_new(&ext_devt_idr, part, &idx); - } while (rc == -EAGAIN); - - if (rc) - return rc; - - if (idx > MAX_EXT_DEVT) { - idr_remove(&ext_devt_idr, idx); - return -EBUSY; - } - - *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); - return 0; -} - -/** - * blk_free_devt - free a dev_t - * @devt: dev_t to free - * - * Free @devt which was allocated using blk_alloc_devt(). - * - * CONTEXT: - * Might sleep. - */ -void blk_free_devt(dev_t devt) -{ - might_sleep(); - - if (devt == MKDEV(0, 0)) - return; - - if (MAJOR(devt) == BLOCK_EXT_MAJOR) { - mutex_lock(&ext_devt_mutex); - idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); - mutex_unlock(&ext_devt_mutex); - } -} - -static char *bdevt_str(dev_t devt, char *buf) -{ - if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { - char tbuf[BDEVT_SIZE]; - snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); - snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); - } else - snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); - - return buf; -} - -/* - * Register device numbers dev..(dev+range-1) - * range must be nonzero - * The hash chain is sorted on range, so that subranges can override. - */ -void blk_register_region(dev_t devt, unsigned long range, struct module *module, - struct kobject *(*probe)(dev_t, int *, void *), - int (*lock)(dev_t, void *), void *data) -{ - kobj_map(bdev_map, devt, range, module, probe, lock, data); -} - -EXPORT_SYMBOL(blk_register_region); - -void blk_unregister_region(dev_t devt, unsigned long range) -{ - kobj_unmap(bdev_map, devt, range); -} - -EXPORT_SYMBOL(blk_unregister_region); - -static struct kobject *exact_match(dev_t devt, int *partno, void *data) -{ - struct gendisk *p = data; - - return &disk_to_dev(p)->kobj; -} - -static int exact_lock(dev_t devt, void *data) -{ - struct gendisk *p = data; - - if (!get_disk(p)) - return -1; - return 0; -} - -#ifndef DDE_LINUX -/** - * add_disk - add partitioning information to kernel list - * @disk: per-device partitioning information - * - * This function registers the partitioning information in @disk - * with the kernel. - * - * FIXME: error handling - */ -void add_disk(struct gendisk *disk) -{ - struct backing_dev_info *bdi; - dev_t devt; - int retval; - - /* minors == 0 indicates to use ext devt from part0 and should - * be accompanied with EXT_DEVT flag. Make sure all - * parameters make sense. - */ - WARN_ON(disk->minors && !(disk->major || disk->first_minor)); - WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT)); - - disk->flags |= GENHD_FL_UP; - - retval = blk_alloc_devt(&disk->part0, &devt); - if (retval) { - WARN_ON(1); - return; - } - disk_to_dev(disk)->devt = devt; - - /* ->major and ->first_minor aren't supposed to be - * dereferenced from here on, but set them just in case. - */ - disk->major = MAJOR(devt); - disk->first_minor = MINOR(devt); - - blk_register_region(disk_devt(disk), disk->minors, NULL, - exact_match, exact_lock, disk); - register_disk(disk); - blk_register_queue(disk); - - bdi = &disk->queue->backing_dev_info; - bdi_register_dev(bdi, disk_devt(disk)); - retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, - "bdi"); - WARN_ON(retval); -} - -EXPORT_SYMBOL(add_disk); -EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ -#endif - -void unlink_gendisk(struct gendisk *disk) -{ - sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); - bdi_unregister(&disk->queue->backing_dev_info); - blk_unregister_queue(disk); - blk_unregister_region(disk_devt(disk), disk->minors); -} - -#ifndef DDE_LINUX -/** - * get_gendisk - get partitioning information for a given device - * @devt: device to get partitioning information for - * @partno: returned partition index - * - * This function gets the structure containing partitioning - * information for the given device @devt. - */ -struct gendisk *get_gendisk(dev_t devt, int *partno) -{ - struct gendisk *disk = NULL; - - if (MAJOR(devt) != BLOCK_EXT_MAJOR) { - struct kobject *kobj; - - kobj = kobj_lookup(bdev_map, devt, partno); - if (kobj) - disk = dev_to_disk(kobj_to_dev(kobj)); - } else { - struct hd_struct *part; - - mutex_lock(&ext_devt_mutex); - part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); - if (part && get_disk(part_to_disk(part))) { - *partno = part->partno; - disk = part_to_disk(part); - } - mutex_unlock(&ext_devt_mutex); - } - - return disk; -} -#endif - -/** - * bdget_disk - do bdget() by gendisk and partition number - * @disk: gendisk of interest - * @partno: partition number - * - * Find partition @partno from @disk, do bdget() on it. - * - * CONTEXT: - * Don't care. - * - * RETURNS: - * Resulting block_device on success, NULL on failure. - */ -struct block_device *bdget_disk(struct gendisk *disk, int partno) -{ - struct hd_struct *part; - struct block_device *bdev = NULL; - - part = disk_get_part(disk, partno); - if (part) - bdev = bdget(part_devt(part)); - disk_put_part(part); - - return bdev; -} -EXPORT_SYMBOL(bdget_disk); - -/* - * print a full list of all partitions - intended for places where the root - * filesystem can't be mounted and thus to give the victim some idea of what - * went wrong - */ -void __init printk_all_partitions(void) -{ - struct class_dev_iter iter; - struct device *dev; - - class_dev_iter_init(&iter, &block_class, NULL, &disk_type); - while ((dev = class_dev_iter_next(&iter))) { - struct gendisk *disk = dev_to_disk(dev); - struct disk_part_iter piter; - struct hd_struct *part; - char name_buf[BDEVNAME_SIZE]; - char devt_buf[BDEVT_SIZE]; - - /* - * Don't show empty devices or things that have been - * surpressed - */ - if (get_capacity(disk) == 0 || - (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) - continue; - - /* - * Note, unlike /proc/partitions, I am showing the - * numbers in hex - the same format as the root= - * option takes. - */ - disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); - while ((part = disk_part_iter_next(&piter))) { - bool is_part0 = part == &disk->part0; - - printk("%s%s %10llu %s", is_part0 ? "" : " ", - bdevt_str(part_devt(part), devt_buf), - (unsigned long long)part->nr_sects >> 1, - disk_name(disk, part->partno, name_buf)); - if (is_part0) { - if (disk->driverfs_dev != NULL && - disk->driverfs_dev->driver != NULL) - printk(" driver: %s\n", - disk->driverfs_dev->driver->name); - else - printk(" (driver?)\n"); - } else - printk("\n"); - } - disk_part_iter_exit(&piter); - } - class_dev_iter_exit(&iter); -} - -#ifdef CONFIG_PROC_FS -/* iterator */ -static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) -{ - loff_t skip = *pos; - struct class_dev_iter *iter; - struct device *dev; - - iter = kmalloc(sizeof(*iter), GFP_KERNEL); - if (!iter) - return ERR_PTR(-ENOMEM); - - seqf->private = iter; - class_dev_iter_init(iter, &block_class, NULL, &disk_type); - do { - dev = class_dev_iter_next(iter); - if (!dev) - return NULL; - } while (skip--); - - return dev_to_disk(dev); -} - -static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) -{ - struct device *dev; - - (*pos)++; - dev = class_dev_iter_next(seqf->private); - if (dev) - return dev_to_disk(dev); - - return NULL; -} - -static void disk_seqf_stop(struct seq_file *seqf, void *v) -{ - struct class_dev_iter *iter = seqf->private; - - /* stop is called even after start failed :-( */ - if (iter) { - class_dev_iter_exit(iter); - kfree(iter); - } -} - -static void *show_partition_start(struct seq_file *seqf, loff_t *pos) -{ - static void *p; - - p = disk_seqf_start(seqf, pos); - if (!IS_ERR(p) && p && !*pos) - seq_puts(seqf, "major minor #blocks name\n\n"); - return p; -} - -static int show_partition(struct seq_file *seqf, void *v) -{ - struct gendisk *sgp = v; - struct disk_part_iter piter; - struct hd_struct *part; - char buf[BDEVNAME_SIZE]; - - /* Don't show non-partitionable removeable devices or empty devices */ - if (!get_capacity(sgp) || (!disk_partitionable(sgp) && - (sgp->flags & GENHD_FL_REMOVABLE))) - return 0; - if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) - return 0; - - /* show the full disk and all non-0 size partitions of it */ - disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); - while ((part = disk_part_iter_next(&piter))) - seq_printf(seqf, "%4d %7d %10llu %s\n", - MAJOR(part_devt(part)), MINOR(part_devt(part)), - (unsigned long long)part->nr_sects >> 1, - disk_name(sgp, part->partno, buf)); - disk_part_iter_exit(&piter); - - return 0; -} - -static const struct seq_operations partitions_op = { - .start = show_partition_start, - .next = disk_seqf_next, - .stop = disk_seqf_stop, - .show = show_partition -}; - -static int partitions_open(struct inode *inode, struct file *file) -{ - return seq_open(file, &partitions_op); -} - -static const struct file_operations proc_partitions_operations = { - .open = partitions_open, - .read = seq_read, - .llseek = seq_lseek, - .release = seq_release, -}; -#endif - - -static struct kobject *base_probe(dev_t devt, int *partno, void *data) -{ - if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) - /* Make old-style 2.4 aliases work */ - request_module("block-major-%d", MAJOR(devt)); - return NULL; -} - -static int __init genhd_device_init(void) -{ - int error; - - block_class.dev_kobj = sysfs_dev_block_kobj; - error = class_register(&block_class); - if (unlikely(error)) - return error; - bdev_map = kobj_map_init(base_probe, &block_class_lock); - blk_dev_init(); - - register_blkdev(BLOCK_EXT_MAJOR, "blkext"); - -#ifndef CONFIG_SYSFS_DEPRECATED - /* create top-level block dir */ - block_depr = kobject_create_and_add("block", NULL); -#endif - return 0; -} - -subsys_initcall(genhd_device_init); - -static ssize_t disk_range_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct gendisk *disk = dev_to_disk(dev); - - return sprintf(buf, "%d\n", disk->minors); -} - -static ssize_t disk_ext_range_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct gendisk *disk = dev_to_disk(dev); - - return sprintf(buf, "%d\n", disk_max_parts(disk)); -} - -static ssize_t disk_removable_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct gendisk *disk = dev_to_disk(dev); - - return sprintf(buf, "%d\n", - (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); -} - -static ssize_t disk_ro_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct gendisk *disk = dev_to_disk(dev); - - return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); -} - -static ssize_t disk_capability_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct gendisk *disk = dev_to_disk(dev); - - return sprintf(buf, "%x\n", disk->flags); -} - -static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); -static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); -static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); -static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); -static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); -static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); -static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); -#ifdef CONFIG_FAIL_MAKE_REQUEST -static struct device_attribute dev_attr_fail = - __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); -#endif -#ifdef CONFIG_FAIL_IO_TIMEOUT -static struct device_attribute dev_attr_fail_timeout = - __ATTR(io-timeout-fail, S_IRUGO|S_IWUSR, part_timeout_show, - part_timeout_store); -#endif - -static struct attribute *disk_attrs[] = { - &dev_attr_range.attr, - &dev_attr_ext_range.attr, - &dev_attr_removable.attr, - &dev_attr_ro.attr, - &dev_attr_size.attr, - &dev_attr_capability.attr, - &dev_attr_stat.attr, -#ifdef CONFIG_FAIL_MAKE_REQUEST - &dev_attr_fail.attr, -#endif -#ifdef CONFIG_FAIL_IO_TIMEOUT - &dev_attr_fail_timeout.attr, -#endif - NULL -}; - -static struct attribute_group disk_attr_group = { - .attrs = disk_attrs, -}; - -static struct attribute_group *disk_attr_groups[] = { - &disk_attr_group, - NULL -}; - -static void disk_free_ptbl_rcu_cb(struct rcu_head *head) -{ - struct disk_part_tbl *ptbl = - container_of(head, struct disk_part_tbl, rcu_head); - - kfree(ptbl); -} - -/** - * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way - * @disk: disk to replace part_tbl for - * @new_ptbl: new part_tbl to install - * - * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The - * original ptbl is freed using RCU callback. - * - * LOCKING: - * Matching bd_mutx locked. - */ -static void disk_replace_part_tbl(struct gendisk *disk, - struct disk_part_tbl *new_ptbl) -{ - struct disk_part_tbl *old_ptbl = disk->part_tbl; - - rcu_assign_pointer(disk->part_tbl, new_ptbl); - - if (old_ptbl) { - rcu_assign_pointer(old_ptbl->last_lookup, NULL); -#ifndef DDE_LINUX - call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb); -#else - disk_free_ptbl_rcu_cb(&old_ptbl->rcu_head); -#endif - } -} - -/** - * disk_expand_part_tbl - expand disk->part_tbl - * @disk: disk to expand part_tbl for - * @partno: expand such that this partno can fit in - * - * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl - * uses RCU to allow unlocked dereferencing for stats and other stuff. - * - * LOCKING: - * Matching bd_mutex locked, might sleep. - * - * RETURNS: - * 0 on success, -errno on failure. - */ -int disk_expand_part_tbl(struct gendisk *disk, int partno) -{ - struct disk_part_tbl *old_ptbl = disk->part_tbl; - struct disk_part_tbl *new_ptbl; - int len = old_ptbl ? old_ptbl->len : 0; - int target = partno + 1; - size_t size; - int i; - - /* disk_max_parts() is zero during initialization, ignore if so */ - if (disk_max_parts(disk) && target > disk_max_parts(disk)) - return -EINVAL; - - if (target <= len) - return 0; - - size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]); - new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id); - if (!new_ptbl) - return -ENOMEM; - - INIT_RCU_HEAD(&new_ptbl->rcu_head); - new_ptbl->len = target; - - for (i = 0; i < len; i++) - rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]); - - disk_replace_part_tbl(disk, new_ptbl); - return 0; -} - -static void disk_release(struct device *dev) -{ - struct gendisk *disk = dev_to_disk(dev); - - kfree(disk->random); - disk_replace_part_tbl(disk, NULL); - free_part_stats(&disk->part0); - kfree(disk); -} -struct class block_class = { - .name = "block", -}; - -static struct device_type disk_type = { - .name = "disk", - .groups = disk_attr_groups, - .release = disk_release, -}; - -#ifdef CONFIG_PROC_FS -/* - * aggregate disk stat collector. Uses the same stats that the sysfs - * entries do, above, but makes them available through one seq_file. - * - * The output looks suspiciously like /proc/partitions with a bunch of - * extra fields. - */ -static int diskstats_show(struct seq_file *seqf, void *v) -{ - struct gendisk *gp = v; - struct disk_part_iter piter; - struct hd_struct *hd; - char buf[BDEVNAME_SIZE]; - int cpu; - - /* - if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) - seq_puts(seqf, "major minor name" - " rio rmerge rsect ruse wio wmerge " - "wsect wuse running use aveq" - "\n\n"); - */ - - disk_part_iter_init(&piter, gp, DISK_PITER_INCL_PART0); - while ((hd = disk_part_iter_next(&piter))) { - cpu = part_stat_lock(); - part_round_stats(cpu, hd); - part_stat_unlock(); - seq_printf(seqf, "%4d %7d %s %lu %lu %llu " - "%u %lu %lu %llu %u %u %u %u\n", - MAJOR(part_devt(hd)), MINOR(part_devt(hd)), - disk_name(gp, hd->partno, buf), - part_stat_read(hd, ios[0]), - part_stat_read(hd, merges[0]), - (unsigned long long)part_stat_read(hd, sectors[0]), - jiffies_to_msecs(part_stat_read(hd, ticks[0])), - part_stat_read(hd, ios[1]), - part_stat_read(hd, merges[1]), - (unsigned long long)part_stat_read(hd, sectors[1]), - jiffies_to_msecs(part_stat_read(hd, ticks[1])), - hd->in_flight, - jiffies_to_msecs(part_stat_read(hd, io_ticks)), - jiffies_to_msecs(part_stat_read(hd, time_in_queue)) - ); - } - disk_part_iter_exit(&piter); - - return 0; -} - -static const struct seq_operations diskstats_op = { - .start = disk_seqf_start, - .next = disk_seqf_next, - .stop = disk_seqf_stop, - .show = diskstats_show -}; - -static int diskstats_open(struct inode *inode, struct file *file) -{ - return seq_open(file, &diskstats_op); -} - -static const struct file_operations proc_diskstats_operations = { - .open = diskstats_open, - .read = seq_read, - .llseek = seq_lseek, - .release = seq_release, -}; - -static int __init proc_genhd_init(void) -{ - proc_create("diskstats", 0, NULL, &proc_diskstats_operations); - proc_create("partitions", 0, NULL, &proc_partitions_operations); - return 0; -} -module_init(proc_genhd_init); -#endif /* CONFIG_PROC_FS */ - -static void media_change_notify_thread(struct work_struct *work) -{ - struct gendisk *gd = container_of(work, struct gendisk, async_notify); - char event[] = "MEDIA_CHANGE=1"; - char *envp[] = { event, NULL }; - - /* - * set enviroment vars to indicate which event this is for - * so that user space will know to go check the media status. - */ - kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); - put_device(gd->driverfs_dev); -} - -#if 0 -void genhd_media_change_notify(struct gendisk *disk) -{ - get_device(disk->driverfs_dev); - schedule_work(&disk->async_notify); -} -EXPORT_SYMBOL_GPL(genhd_media_change_notify); -#endif /* 0 */ - -dev_t blk_lookup_devt(const char *name, int partno) -{ - dev_t devt = MKDEV(0, 0); - struct class_dev_iter iter; - struct device *dev; - - class_dev_iter_init(&iter, &block_class, NULL, &disk_type); - while ((dev = class_dev_iter_next(&iter))) { - struct gendisk *disk = dev_to_disk(dev); - struct hd_struct *part; - - if (strcmp(dev_name(dev), name)) - continue; - - if (partno < disk->minors) { - /* We need to return the right devno, even - * if the partition doesn't exist yet. - */ - devt = MKDEV(MAJOR(dev->devt), - MINOR(dev->devt) + partno); - break; - } - part = disk_get_part(disk, partno); - if (part) { - devt = part_devt(part); - disk_put_part(part); - break; - } - disk_put_part(part); - } - class_dev_iter_exit(&iter); - return devt; -} -EXPORT_SYMBOL(blk_lookup_devt); - -struct gendisk *alloc_disk(int minors) -{ - return alloc_disk_node(minors, -1); -} -EXPORT_SYMBOL(alloc_disk); - -struct gendisk *alloc_disk_node(int minors, int node_id) -{ - struct gendisk *disk; - - disk = kmalloc_node(sizeof(struct gendisk), - GFP_KERNEL | __GFP_ZERO, node_id); - if (disk) { - if (!init_part_stats(&disk->part0)) { - kfree(disk); - return NULL; - } - disk->node_id = node_id; - if (disk_expand_part_tbl(disk, 0)) { - free_part_stats(&disk->part0); - kfree(disk); - return NULL; - } - disk->part_tbl->part[0] = &disk->part0; - - disk->minors = minors; -#ifndef DDE_LINUX - rand_initialize_disk(disk); -#endif - disk_to_dev(disk)->class = &block_class; - disk_to_dev(disk)->type = &disk_type; - device_initialize(disk_to_dev(disk)); - INIT_WORK(&disk->async_notify, - media_change_notify_thread); - } - return disk; -} -EXPORT_SYMBOL(alloc_disk_node); - -struct kobject *get_disk(struct gendisk *disk) -{ - struct module *owner; - struct kobject *kobj; - - if (!disk->fops) - return NULL; - owner = disk->fops->owner; - if (owner && !try_module_get(owner)) - return NULL; - kobj = kobject_get(&disk_to_dev(disk)->kobj); - if (kobj == NULL) { - module_put(owner); - return NULL; - } - return kobj; - -} - -EXPORT_SYMBOL(get_disk); - -void put_disk(struct gendisk *disk) -{ - if (disk) - kobject_put(&disk_to_dev(disk)->kobj); -} - -EXPORT_SYMBOL(put_disk); - -void set_device_ro(struct block_device *bdev, int flag) -{ - bdev->bd_part->policy = flag; -} - -EXPORT_SYMBOL(set_device_ro); - -void set_disk_ro(struct gendisk *disk, int flag) -{ - struct disk_part_iter piter; - struct hd_struct *part; - - disk_part_iter_init(&piter, disk, - DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0); - while ((part = disk_part_iter_next(&piter))) - part->policy = flag; - disk_part_iter_exit(&piter); -} - -EXPORT_SYMBOL(set_disk_ro); - -int bdev_read_only(struct block_device *bdev) -{ - if (!bdev) - return 0; - return bdev->bd_part->policy; -} - -EXPORT_SYMBOL(bdev_read_only); - -int invalidate_partition(struct gendisk *disk, int partno) -{ - int res = 0; - struct block_device *bdev = bdget_disk(disk, partno); - if (bdev) { - fsync_bdev(bdev); - res = __invalidate_device(bdev); - bdput(bdev); - } - return res; -} - -EXPORT_SYMBOL(invalidate_partition); |