Release 4.7 block/genhd.c
/*
* 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/backing-dev.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/mutex.h>
#include <linux/idr.h>
#include <linux/log2.h>
#include <linux/pm_runtime.h>
#include <linux/badblocks.h>
#include "blk.h"
static DEFINE_MUTEX(block_class_lock);
struct kobject *block_depr;
/* for extended dynamic devt allocation, currently only one major is used */
#define NR_EXT_DEVT (1 << MINORBITS)
/* For extended devt allocation. ext_devt_lock prevents look up
* results from going away underneath its user.
*/
static DEFINE_SPINLOCK(ext_devt_lock);
static DEFINE_IDR(ext_devt_idr);
static struct device_type disk_type;
static void disk_check_events(struct disk_events *ev,
unsigned int *clearing_ptr);
static void disk_alloc_events(struct gendisk *disk);
static void disk_add_events(struct gendisk *disk);
static void disk_del_events(struct gendisk *disk);
static void disk_release_events(struct gendisk *disk);
/**
* 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;
}
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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 | DISK_PITER_INCL_EMPTY_PART0))
piter->idx = 0;
else
piter->idx = 1;
piter->flags = flags;
rcu_read_unlock();
}
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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 |
DISK_PITER_INCL_EMPTY_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 (!part_nr_sects_read(part) &&
!(piter->flags & DISK_PITER_INCL_EMPTY) &&
!(piter->flags & DISK_PITER_INCL_EMPTY_PART0 &&
piter->idx == 0))
continue;
get_device(part_to_dev(part));
piter->part = part;
piter->idx += inc;
break;
}
rcu_read_unlock();
return piter->part;
}
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| Total | 207 | 100.00% | 6 | 100.00% |
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;
}
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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_read(part);
}
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/**
* 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;
}
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| Total | 120 | 100.00% | 5 | 100.00% |
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(unsigned major)
{
return major % BLKDEV_MAJOR_HASH_SIZE;
}
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| Total | 15 | 100.00% | 3 | 100.00% |
#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);
}
}
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neil horman | neil horman | 6 | 8.57% | 1 | 14.29% |
al viro | al viro | 2 | 2.86% | 1 | 14.29% |
tejun heo | tejun heo | 2 | 2.86% | 1 | 14.29% |
kay sievers | kay sievers | 2 | 2.86% | 1 | 14.29% |
jes sorensen | jes sorensen | 1 | 1.43% | 1 | 14.29% |
| Total | 70 | 100.00% | 7 | 100.00% |
#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;
}
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ben collins | ben collins | 1 | 0.39% | 1 | 14.29% |
| Total | 257 | 100.00% | 7 | 100.00% |
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);
}
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akinobu mita | akinobu mita | 8 | 6.30% | 2 | 28.57% |
christoph hellwig | christoph hellwig | 5 | 3.94% | 1 | 14.29% |
jes sorensen | jes sorensen | 2 | 1.57% | 1 | 14.29% |
kay sievers | kay sievers | 2 | 1.57% | 1 | 14.29% |
| Total | 127 | 100.00% | 7 | 100.00% |
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;
}
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/**
* 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;
/* in consecutive minor range? */
if (part->partno < disk->minors) {
*devt = MKDEV(disk->major, disk->first_minor + part->partno);
return 0;
}
/* allocate ext devt */
idr_preload(GFP_KERNEL);
spin_lock_bh(&ext_devt_lock);
idx = idr_alloc(&ext_devt_idr, part, 0, NR_EXT_DEVT, GFP_NOWAIT);
spin_unlock_bh(&ext_devt_lock);
idr_preload_end();
if (idx < 0)
return idx == -ENOSPC ? -EBUSY : idx;
*devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx));
return 0;
}
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tejun heo | tejun heo | 110 | 83.97% | 4 | 57.14% |
keith busch | keith busch | 11 | 8.40% | 1 | 14.29% |
tomas henzl | tomas henzl | 8 | 6.11% | 1 | 14.29% |
dan williams | dan williams | 2 | 1.53% | 1 | 14.29% |
| Total | 131 | 100.00% | 7 | 100.00% |
/**
* 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)
{
if (devt == MKDEV(0, 0))
return;
if (MAJOR(devt) == BLOCK_EXT_MAJOR) {
spin_lock_bh(&ext_devt_lock);
idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt)));
spin_unlock_bh(&ext_devt_lock);
}
}
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| Total | 57 | 100.00% | 4 | 100.00% |
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;
}
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tejun heo | tejun heo | 91 | 100.00% | 1 | 100.00% |
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/*
* 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);
}
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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;
}
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| Total | 35 | 100.00% | 7 | 100.00% |
static int exact_lock(dev_t devt, void *data)
{
struct gendisk *p = data;
if (!get_disk(p))
return -1;
return 0;
}
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static void register_disk(struct gendisk *disk)
{
struct device *ddev = disk_to_dev(disk);
struct block_device *bdev;
struct disk_part_iter piter;
struct hd_struct *part;
int err;
ddev->parent = disk->driverfs_dev;
dev_set_name(ddev, "%s", disk->disk_name);
/* delay uevents, until we scanned partition table */
dev_set_uevent_suppress(ddev, 1);
if (device_add(ddev))
return;
if (!sysfs_deprecated) {
err = sysfs_create_link(block_depr, &ddev->kobj,
kobject_name(&ddev->kobj));
if (err) {
device_del(ddev);
return;
}
}
/*
* avoid probable deadlock caused by allocating memory with
* GFP_KERNEL in runtime_resume callback of its all ancestor
* devices
*/
pm_runtime_set_memalloc_noio(ddev, true);
disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
/* No minors to use for partitions */
if (!disk_part_scan_enabled(disk))
goto exit;
/* No such device (e.g., media were just removed) */
if (!get_capacity(disk))
goto exit;
bdev = bdget_disk(disk, 0);
if (!bdev)
goto exit;
bdev->bd_invalidated = 1;
err = blkdev_get(bdev, FMODE_READ, NULL);
if (err < 0)
goto exit;
blkdev_put(bdev, FMODE_READ);
exit:
/* announce disk after possible partitions are created */
dev_set_uevent_suppress(ddev, 0);
kobject_uevent(&ddev->kobj, KOBJ_ADD);
/* announce possible partitions */
disk_part_iter_init(&piter, disk, 0);
while ((part = disk_part_iter_next(&piter)))
kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
disk_part_iter_exit(&piter);
}
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peter zijlstra | peter zijlstra | 12 | 4.20% | 1 | 5.88% |
linus torvalds | linus torvalds | 9 | 3.15% | 2 | 11.76% |
ming lei | ming lei | 8 | 2.80% | 1 | 5.88% |
jan kara | jan kara | 6 | 2.10% | 1 | 5.88% |
greg kroah-hartman | greg kroah-hartman | 4 | 1.40% | 1 | 5.88% |
jens axboe | jens axboe | 3 | 1.05% | 1 | 5.88% |
kees cook | kees cook | 2 | 0.70% | 1 | 5.88% |
| Total | 286 | 100.00% | 17 | 100.00% |
/**
* 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);
disk_alloc_events(disk);
/* Register BDI before referencing it from bdev */
bdi = &disk->queue->backing_dev_info;
bdi_register_dev(bdi, disk_devt(disk));
blk_register_region(disk_devt(disk), disk->minors, NULL,
exact_match, exact_lock, disk);
register_disk(disk);
blk_register_queue(disk);
/*
* Take an extra ref on queue which will be put on disk_release()
* so that it sticks around as long as @disk is there.
*/
WARN_ON_ONCE(!blk_get_queue(disk->queue));
retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,
"bdi");
WARN_ON(retval);
disk_add_events(disk);
blk_integrity_add(disk);
}
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| Person | Tokens | Prop | Commits | CommitProp |
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al viro | al viro | 37 | 16.82% | 7 | 25.93% |
peter zijlstra | peter zijlstra | 24 | 10.91% | 1 | 3.70% |
jan kara | jan kara | 14 | 6.36% | 1 | 3.70% |
linus torvalds | linus torvalds | 9 | 4.09% | 2 | 7.41% |
greg kroah-hartman | greg kroah-hartman | 7 | 3.18% | 1 | 3.70% |
stanislaw gruszka | stanislaw gruszka | 5 | 2.27% | 1 | 3.70% |
martin k. petersen | martin k. petersen | 5 | 2.27% | 1 | 3.70% |
jens axboe | jens axboe | 3 | 1.36% | 1 | 3.70% |
kay sievers | kay sievers | 2 | 0.91% | 1 | 3.70% |
divyesh shah | divyesh shah | 2 | 0.91% | 1 | 3.70% |
andrew morton | andrew morton | 1 | 0.45% | 1 | 3.70% |
| Total | 220 | 100.00% | 27 | 100.00% |
EXPORT_SYMBOL(add_disk);
void del_gendisk(struct gendisk *disk)
{
struct disk_part_iter piter;
struct hd_struct *part;
blk_integrity_del(disk);
disk_del_events(disk);
/* invalidate stuff */
disk_part_iter_init(&piter, disk,
DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
while ((part = disk_part_iter_next(&piter))) {
invalidate_partition(disk, part->partno);
delete_partition(disk, part->partno);
}
disk_part_iter_exit(&piter);
invalidate_partition(disk, 0);
set_capacity(disk, 0);
disk->flags &= ~GENHD_FL_UP;
sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");
blk_unregister_queue(disk);
blk_unregister_region(disk_devt(disk), disk->minors);
part_stat_set_all(&disk->part0, 0);
disk->part0.stamp = 0;
kobject_put(disk->part0.holder_dir);
kobject_put(disk->slave_dir);
if (!sysfs_deprecated)
sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
pm_runtime_set_memalloc_noio(disk_to_dev(disk), false);
device_del(disk_to_dev(disk));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 128 | 63.68% | 7 | 38.89% |
david alan gilbert | david alan gilbert | 26 | 12.94% | 1 | 5.56% |
ming lei | ming lei | 10 | 4.98% | 1 | 5.56% |
will drewry | will drewry | 8 | 3.98% | 1 | 5.56% |
peter zijlstra | peter zijlstra | 7 | 3.48% | 1 | 5.56% |
martin k. petersen | martin k. petersen | 5 | 2.49% | 1 | 5.56% |
al viro | al viro | 5 | 2.49% | 1 | 5.56% |
linus torvalds | linus torvalds | 5 | 2.49% | 2 | 11.11% |
greg kroah-hartman | greg kroah-hartman | 3 | 1.49% | 1 | 5.56% |
jens axboe | jens axboe | 3 | 1.49% | 1 | 5.56% |
andrew morton | andrew morton | 1 | 0.50% | 1 | 5.56% |
| Total | 201 | 100.00% | 18 | 100.00% |
EXPORT_SYMBOL(del_gendisk);
/* sysfs access to bad-blocks list. */
static ssize_t disk_badblocks_show(struct device *dev,
struct device_attribute *attr,
char *page)
{
struct gendisk *disk = dev_to_disk(dev);
if (!disk->bb)
return sprintf(page, "\n");
return badblocks_show(disk->bb, page, 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
vishal verma | vishal verma | 57 | 100.00% | 1 | 100.00% |
| Total | 57 | 100.00% | 1 | 100.00% |
static ssize_t disk_badblocks_store(struct device *dev,
struct device_attribute *attr,
const char *page, size_t len)
{
struct gendisk *disk = dev_to_disk(dev);
if (!disk->bb)
return -ENXIO;
return badblocks_store(disk->bb, page, len, 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
vishal verma | vishal verma | 59 | 100.00% | 1 | 100.00% |
| Total | 59 | 100.00% | 1 | 100.00% |
/**
* 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;
spin_lock_bh(&ext_devt_lock);
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);
}
spin_unlock_bh(&ext_devt_lock);
}
return disk;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 84 | 65.12% | 5 | 27.78% |
greg kroah-hartman | greg kroah-hartman | 15 | 11.63% | 2 | 11.11% |
al viro | al viro | 11 | 8.53% | 5 | 27.78% |
kay sievers | kay sievers | 7 | 5.43% | 1 | 5.56% |
linus torvalds | linus torvalds | 4 | 3.10% | 1 | 5.56% |
dave jones | dave jones | 3 | 2.33% | 1 | 5.56% |
keith busch | keith busch | 2 | 1.55% | 1 | 5.56% |
dan williams | dan williams | 2 | 1.55% | 1 | 5.56% |
harvey harrison | harvey harrison | 1 | 0.78% | 1 | 5.56% |
| Total | 129 | 100.00% | 18 | 100.00% |
EXPORT_SYMBOL(get_gendisk);
/**
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 35 | 60.34% | 4 | 44.44% |
kay sievers | kay sievers | 9 | 15.52% | 2 | 22.22% |
dave jones | dave jones | 7 | 12.07% | 1 | 11.11% |
al viro | al viro | 4 | 6.90% | 1 | 11.11% |
greg kroah-hartman | greg kroah-hartman | 3 | 5.17% | 1 | 11.11% |
| Total | 58 | 100.00% | 9 | 100.00% |
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
* suppressed
*/
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 %s", is_part0 ? "" : " ",
bdevt_str(part_devt(part), devt_buf),
(unsigned long long)part_nr_sects_read(part) >> 1
, disk_name(disk, part->partno, name_buf),
part->info ? part->info->uuid : "");
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 128 | 52.24% | 5 | 21.74% |
david alan gilbert | david alan gilbert | 48 | 19.59% | 1 | 4.35% |
linus torvalds | linus torvalds | 17 | 6.94% | 2 | 8.70% |
andrew morton | andrew morton | 13 | 5.31% | 4 | 17.39% |
stephen warren | stephen warren | 11 | 4.49% | 1 | 4.35% |
dave jones | dave jones | 10 | 4.08% | 1 | 4.35% |
greg kroah-hartman | greg kroah-hartman | 5 | 2.04% | 1 | 4.35% |
al viro | al viro | 4 | 1.63% | 3 | 13.04% |
vivek goyal | vivek goyal | 3 | 1.22% | 1 | 4.35% |
kay sievers | kay sievers | 2 | 0.82% | 1 | 4.35% |
will drewry | will drewry | 2 | 0.82% | 1 | 4.35% |
rusty russell | rusty russell | 1 | 0.41% | 1 | 4.35% |
lucas de marchi | lucas de marchi | 1 | 0.41% | 1 | 4.35% |
| Total | 245 | 100.00% | 23 | 100.00% |
#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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 51 | 48.11% | 1 | 6.25% |
greg kroah-hartman | greg kroah-hartman | 15 | 14.15% | 2 | 12.50% |
al viro | al viro | 9 | 8.49% | 2 | 12.50% |
andrew morton | andrew morton | 6 | 5.66% | 1 | 6.25% |
alexey dobriyan | alexey dobriyan | 4 | 3.77% | 1 | 6.25% |
andi kleen | andi kleen | 4 | 3.77% | 1 | 6.25% |
kay sievers | kay sievers | 4 | 3.77% | 2 | 12.50% |
yanmin zhang | yanmin zhang | 3 | 2.83% | 1 | 6.25% |
dave jones | dave jones | 3 | 2.83% | 1 | 6.25% |
linus torvalds | linus torvalds | 3 | 2.83% | 1 | 6.25% |
dan williams | dan williams | 2 | 1.89% | 1 | 6.25% |
harvey harrison | harvey harrison | 1 | 0.94% | 1 | 6.25% |
pre-git | pre-git | 1 | 0.94% | 1 | 6.25% |
| Total | 106 | 100.00% | 16 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 20 | 37.74% | 3 | 33.33% |
patrick mochel | patrick mochel | 15 | 28.30% | 2 | 22.22% |
dave jones | dave jones | 9 | 16.98% | 1 | 11.11% |
kay sievers | kay sievers | 5 | 9.43% | 1 | 11.11% |
greg kroah-hartman | greg kroah-hartman | 4 | 7.55% | 2 | 22.22% |
| Total | 53 | 100.00% | 9 | 100.00% |
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);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 21 | 51.22% | 1 | 25.00% |
kay sievers | kay sievers | 13 | 31.71% | 1 | 25.00% |
greg kroah-hartman | greg kroah-hartman | 4 | 9.76% | 1 | 25.00% |
olaf hering | olaf hering | 3 | 7.32% | 1 | 25.00% |
| Total | 41 | 100.00% | 4 | 100.00% |
static void *show_partition_start(struct seq_file *seqf, loff_t *pos)
{
void *p;
p = disk_seqf_start(seqf, pos);
if (!IS_ERR_OR_NULL(p) && !*pos)
seq_puts(seqf, "major minor #blocks name\n\n");
return p;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 23 | 45.10% | 3 | 37.50% |
kay sievers | kay sievers | 19 | 37.25% | 2 | 25.00% |
dave jones | dave jones | 5 | 9.80% | 1 | 12.50% |
greg kroah-hartman | greg kroah-hartman | 3 | 5.88% | 1 | 12.50% |
jens axboe | jens axboe | 1 | 1.96% | 1 | 12.50% |
| Total | 51 | 100.00% | 8 | 100.00% |
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_max_parts(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_read(part) >> 1,
disk_name(sgp, part->partno, buf));
disk_part_iter_exit(&piter);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 40 | 25.97% | 6 | 24.00% |
andrew morton | andrew morton | 27 | 17.53% | 4 | 16.00% |
martin k. petersen | martin k. petersen | 22 | 14.29% | 2 | 8.00% |
kay sievers | kay sievers | 16 | 10.39% | 2 | 8.00% |
linus torvalds | linus torvalds | 15 | 9.74% | 2 | 8.00% |
dave jones | dave jones | 14 | 9.09% | 1 | 4.00% |
kristen carlson accardi | kristen carlson accardi | 7 | 4.55% | 1 | 4.00% |
al viro | al viro | 5 | 3.25% | 3 | 12.00% |
akinobu mita | akinobu mita | 3 | 1.95% | 1 | 4.00% |
vivek goyal | vivek goyal | 3 | 1.95% | 1 | 4.00% |
rusty russell | rusty russell | 1 | 0.65% | 1 | 4.00% |
andries brouwer | andries brouwer | 1 | 0.65% | 1 | 4.00% |
| Total | 154 | 100.00% | 25 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
alexey dobriyan | alexey dobriyan | 20 | 80.00% | 1 | 50.00% |
jens axboe | jens axboe | 5 | 20.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
al viro | al viro | 22 | 42.31% | 2 | 28.57% |
andrew morton | andrew morton | 18 | 34.62% | 1 | 14.29% |
kay sievers | kay sievers | 10 | 19.23% | 2 | 28.57% |
linus torvalds | linus torvalds | 1 | 1.92% | 1 | 14.29% |
tejun heo | tejun heo | 1 | 1.92% | 1 | 14.29% |
| Total | 52 | 100.00% | 7 | 100.00% |
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");
/* create top-level block dir */
if (!sysfs_deprecated)
block_depr = kobject_create_and_add("block", NULL);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
roland mcgrath | roland mcgrath | 12 | 16.22% | 1 | 5.56% |
al viro | al viro | 11 | 14.86% | 3 | 16.67% |
dan williams | dan williams | 10 | 13.51% | 1 | 5.56% |
kay sievers | kay sievers | 9 | 12.16% | 1 | 5.56% |
pre-git | pre-git | 8 | 10.81% | 4 | 22.22% |
yanmin zhang | yanmin zhang | 7 | 9.46% | 1 | 5.56% |
andi kleen | andi kleen | 5 | 6.76% | 1 | 5.56% |
greg kroah-hartman | greg kroah-hartman | 5 | 6.76% | 1 | 5.56% |
linus torvalds | linus torvalds | 2 | 2.70% | 1 | 5.56% |
tejun heo | tejun heo | 2 | 2.70% | 1 | 5.56% |
anton blanchard | anton blanchard | 1 | 1.35% | 1 | 5.56% |
randy dunlap | randy dunlap | 1 | 1.35% | 1 | 5.56% |
patrick mochel | patrick mochel | 1 | 1.35% | 1 | 5.56% |
| Total | 74 | 100.00% | 18 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
patrick mochel | patrick mochel | 18 | 42.86% | 2 | 50.00% |
kay sievers | kay sievers | 13 | 30.95% | 1 | 25.00% |
tejun heo | tejun heo | 11 | 26.19% | 1 | 25.00% |
| Total | 42 | 100.00% | 4 | 100.00% |
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));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 43 | 100.00% | 2 | 100.00% |
| Total | 43 | 100.00% | 2 | 100.00% |
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));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kay sievers | kay sievers | 30 | 60.00% | 2 | 66.67% |
olaf hering | olaf hering | 20 | 40.00% | 1 | 33.33% |
| Total | 50 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kay sievers | kay sievers | 44 | 93.62% | 1 | 50.00% |
tejun heo | tejun heo | 3 | 6.38% | 1 | 50.00% |
| Total | 47 | 100.00% | 2 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kristen carlson accardi | kristen carlson accardi | 22 | 52.38% | 1 | 50.00% |
kay sievers | kay sievers | 20 | 47.62% | 1 | 50.00% |
| Total | 42 | 100.00% | 2 | 100.00% |
static ssize_t disk_alignment_offset_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
return sprintf(buf, "%d\n", queue_alignment_offset(disk->queue));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
martin k. petersen | martin k. petersen | 45 | 100.00% | 1 | 100.00% |
| Total | 45 | 100.00% | 1 | 100.00% |
static ssize_t disk_discard_alignment_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
martin k. petersen | martin k. petersen | 45 | 100.00% | 2 | 100.00% |
| Total | 45 | 100.00% | 2 | 100.00% |
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(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL);
static DEVICE_ATTR(discard_alignment, S_IRUGO, disk_discard_alignment_show,
NULL);
static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL);
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
static DEVICE_ATTR(badblocks, S_IRUGO | S_IWUSR, disk_badblocks_show,
disk_badblocks_store);
#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_alignment_offset.attr,
&dev_attr_discard_alignment.attr,
&dev_attr_capability.attr,
&dev_attr_stat.attr,
&dev_attr_inflight.attr,
&dev_attr_badblocks.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 const struct attribute_group *disk_attr_groups[] = {
&disk_attr_group,
NULL
};
/**
* 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);
kfree_rcu(old_ptbl, rcu_head);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 43 | 76.79% | 1 | 33.33% |
jens axboe | jens axboe | 11 | 19.64% | 1 | 33.33% |
lai jiangshan | lai jiangshan | 2 | 3.57% | 1 | 33.33% |
| Total | 56 | 100.00% | 3 | 100.00% |
/**
* 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 i, target;
size_t size;
/*
* check for int overflow, since we can get here from blkpg_ioctl()
* with a user passed 'partno'.
*/
target = partno + 1;
if (target < 0)
return -EINVAL;
/* 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;
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 160 | 89.39% | 1 | 50.00% |
jens axboe | jens axboe | 19 | 10.61% | 1 | 50.00% |
| Total | 179 | 100.00% | 2 | 100.00% |
static void disk_release(struct device *dev)
{
struct gendisk *disk = dev_to_disk(dev);
blk_free_devt(dev->devt);
disk_release_events(disk);
kfree(disk->random);
disk_replace_part_tbl(disk, NULL);
hd_free_part(&disk->part0);
if (disk->queue)
blk_put_queue(disk->queue);
kfree(disk);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 37 | 50.68% | 4 | 36.36% |
kay sievers | kay sievers | 15 | 20.55% | 2 | 18.18% |
will drewry | will drewry | 7 | 9.59% | 1 | 9.09% |
keith busch | keith busch | 7 | 9.59% | 1 | 9.09% |
andrew morton | andrew morton | 4 | 5.48% | 1 | 9.09% |
greg kroah-hartman | greg kroah-hartman | 2 | 2.74% | 1 | 9.09% |
lei ming | lei ming | 1 | 1.37% | 1 | 9.09% |
| Total | 73 | 100.00% | 11 | 100.00% |
struct class block_class = {
.name = "block",
};
static char *block_devnode(struct device *dev, umode_t *mode,
kuid_t *uid, kgid_t *gid)
{
struct gendisk *disk = dev_to_disk(dev);
if (disk->devnode)
return disk->devnode(disk, mode);
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kay sievers | kay sievers | 50 | 94.34% | 3 | 60.00% |
greg kroah-hartman | greg kroah-hartman | 2 | 3.77% | 1 | 20.00% |
al viro | al viro | 1 | 1.89% | 1 | 20.00% |
| Total | 53 | 100.00% | 5 | 100.00% |
static struct device_type disk_type = {
.name = "disk",
.groups = disk_attr_groups,
.release = disk_release,
.devnode = block_devnode,
};
#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_EMPTY_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 %lu "
"%u %lu %lu %lu %u %u %u %u\n",
MAJOR(part_devt(hd)), MINOR(part_devt(hd)),
disk_name(gp, hd->partno, buf),
part_stat_read(hd, ios[READ]),
part_stat_read(hd, merges[READ]),
part_stat_read(hd, sectors[READ]),
jiffies_to_msecs(part_stat_read(hd, ticks[READ])),
part_stat_read(hd, ios[WRITE]),
part_stat_read(hd, merges[WRITE]),
part_stat_read(hd, sectors[WRITE]),
jiffies_to_msecs(part_stat_read(hd, ticks[WRITE])),
part_in_flight(hd),
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
jerome marchand | jerome marchand | 89 | 37.87% | 1 | 7.14% |
tejun heo | tejun heo | 63 | 26.81% | 7 | 50.00% |
andrew morton | andrew morton | 57 | 24.26% | 1 | 7.14% |
jens axboe | jens axboe | 12 | 5.11% | 1 | 7.14% |
liu yuan | liu yuan | 8 | 3.40% | 1 | 7.14% |
nikanth karthikesan | nikanth karthikesan | 3 | 1.28% | 1 | 7.14% |
herbert poetzl | herbert poetzl | 2 | 0.85% | 1 | 7.14% |
rusty russell | rusty russell | 1 | 0.43% | 1 | 7.14% |
| Total | 235 | 100.00% | 14 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
alexey dobriyan | alexey dobriyan | 25 | 100.00% | 1 | 100.00% |
| Total | 25 | 100.00% | 1 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
alexey dobriyan | alexey dobriyan | 36 | 100.00% | 2 | 100.00% |
| Total | 36 | 100.00% | 2 | 100.00% |
module_init(proc_genhd_init);
#endif /* CONFIG_PROC_FS */
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 80 | 49.08% | 5 | 45.45% |
greg kroah-hartman | greg kroah-hartman | 36 | 22.09% | 1 | 9.09% |
neil brown | neil brown | 33 | 20.25% | 1 | 9.09% |
kay sievers | kay sievers | 14 | 8.59% | 4 | 36.36% |
| Total | 163 | 100.00% | 11 | 100.00% |
EXPORT_SYMBOL(blk_lookup_devt);
struct gendisk *alloc_disk(int minors)
{
return alloc_disk_node(minors, NUMA_NO_NODE);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
al viro | al viro | 9 | 50.00% | 2 | 50.00% |
christoph lameter | christoph lameter | 8 | 44.44% | 1 | 25.00% |
ezequiel garcia | ezequiel garcia | 1 | 5.56% | 1 | 25.00% |
| Total | 18 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL(alloc_disk);
struct gendisk *alloc_disk_node(int minors, int node_id)
{
struct gendisk *disk;
disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, 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;
/*
* set_capacity() and get_capacity() currently don't use
* seqcounter to read/update the part0->nr_sects. Still init
* the counter as we can read the sectors in IO submission
* patch using seqence counters.
*
* TODO: Ideally set_capacity() and get_capacity() should be
* converted to make use of bd_mutex and sequence counters.
*/
seqcount_init(&disk->part0.nr_sects_seq);
if (hd_ref_init(&disk->part0)) {
hd_free_part(&disk->part0);
kfree(disk);
return NULL;
}
disk->minors = minors;
rand_initialize_disk(disk);
disk_to_dev(disk)->class = &block_class;
disk_to_dev(disk)->type = &disk_type;
device_initialize(disk_to_dev(disk));
}
return disk;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 48 | 25.53% | 6 | 27.27% |
al viro | al viro | 47 | 25.00% | 4 | 18.18% |
lei ming | lei ming | 20 | 10.64% | 1 | 4.55% |
andrew morton | andrew morton | 15 | 7.98% | 1 | 4.55% |
kay sievers | kay sievers | 11 | 5.85% | 1 | 4.55% |
vivek goyal | vivek goyal | 11 | 5.85% | 1 | 4.55% |
jens axboe | jens axboe | 8 | 4.26% | 1 | 4.55% |
greg kroah-hartman | greg kroah-hartman | 7 | 3.72% | 1 | 4.55% |
christoph lameter | christoph lameter | 6 | 3.19% | 1 | 4.55% |
cheng renquan | cheng renquan | 6 | 3.19% | 1 | 4.55% |
jerome marchand | jerome marchand | 4 | 2.13% | 1 | 4.55% |
patrick mochel | patrick mochel | 4 | 2.13% | 2 | 9.09% |
joe perches | joe perches | 1 | 0.53% | 1 | 4.55% |
| Total | 188 | 100.00% | 22 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
al viro | al viro | 52 | 61.18% | 3 | 42.86% |
andrew morton | andrew morton | 26 | 30.59% | 1 | 14.29% |
tejun heo | tejun heo | 3 | 3.53% | 1 | 14.29% |
patrick mochel | patrick mochel | 3 | 3.53% | 1 | 14.29% |
christoph hellwig | christoph hellwig | 1 | 1.18% | 1 | 14.29% |
| Total | 85 | 100.00% | 7 | 100.00% |
EXPORT_SYMBOL(get_disk);
void put_disk(struct gendisk *disk)
{
if (disk)
kobject_put(&disk_to_dev(disk)->kobj);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
al viro | al viro | 20 | 80.00% | 3 | 60.00% |
tejun heo | tejun heo | 3 | 12.00% | 1 | 20.00% |
patrick mochel | patrick mochel | 2 | 8.00% | 1 | 20.00% |
| Total | 25 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL(put_disk);
static void set_disk_ro_uevent(struct gendisk *gd, int ro)
{
char event[] = "DISK_RO=1";
char *envp[] = { event, NULL };
if (!ro)
event[8] = '0';
kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
hannes reinecke | hannes reinecke | 35 | 60.34% | 1 | 33.33% |
tejun heo | tejun heo | 22 | 37.93% | 1 | 33.33% |
jens axboe | jens axboe | 1 | 1.72% | 1 | 33.33% |
| Total | 58 | 100.00% | 3 | 100.00% |
void set_device_ro(struct block_device *bdev, int flag)
{
bdev->bd_part->policy = flag;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
al viro | al viro | 20 | 95.24% | 2 | 66.67% |
tejun heo | tejun heo | 1 | 4.76% | 1 | 33.33% |
| Total | 21 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL(set_device_ro);
void set_disk_ro(struct gendisk *disk, int flag)
{
struct disk_part_iter piter;
struct hd_struct *part;
if (disk->part0.policy != flag) {
set_disk_ro_uevent(disk, flag);
disk->part0.policy = flag;
}
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
while ((part = disk_part_iter_next(&piter)))
part->policy = flag;
disk_part_iter_exit(&piter);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 54 | 65.06% | 2 | 40.00% |
hannes reinecke | hannes reinecke | 19 | 22.89% | 1 | 20.00% |
al viro | al viro | 9 | 10.84% | 1 | 20.00% |
andrew morton | andrew morton | 1 | 1.20% | 1 | 20.00% |
| Total | 83 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL(set_disk_ro);
int bdev_read_only(struct block_device *bdev)
{
if (!bdev)
return 0;
return bdev->bd_part->policy;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
al viro | al viro | 21 | 84.00% | 2 | 66.67% |
tejun heo | tejun heo | 4 | 16.00% | 1 | 33.33% |
| Total | 25 | 100.00% | 3 | 100.00% |
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, true);
bdput(bdev);
}
return res;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
al viro | al viro | 30 | 51.72% | 1 | 9.09% |
kay sievers | kay sievers | 10 | 17.24% | 3 | 27.27% |
tejun heo | tejun heo | 7 | 12.07% | 2 | 18.18% |
andrew morton | andrew morton | 5 | 8.62% | 2 | 18.18% |
christoph hellwig | christoph hellwig | 2 | 3.45% | 1 | 9.09% |
greg kroah-hartman | greg kroah-hartman | 2 | 3.45% | 1 | 9.09% |
neil brown | neil brown | 2 | 3.45% | 1 | 9.09% |
| Total | 58 | 100.00% | 11 | 100.00% |
EXPORT_SYMBOL(invalidate_partition);
/*
* Disk events - monitor disk events like media change and eject request.
*/
struct disk_events {
struct list_head node; /* all disk_event's */
struct gendisk *disk; /* the associated disk */
spinlock_t lock;
struct mutex block_mutex; /* protects blocking */
int block; /* event blocking depth */
unsigned int pending; /* events already sent out */
unsigned int clearing; /* events being cleared */
long poll_msecs; /* interval, -1 for default */
struct delayed_work dwork;
};
static const char *disk_events_strs[] = {
[ilog2(DISK_EVENT_MEDIA_CHANGE)] = "media_change",
[ilog2(DISK_EVENT_EJECT_REQUEST)] = "eject_request",
};
static char *disk_uevents[] = {
[ilog2(DISK_EVENT_MEDIA_CHANGE)] = "DISK_MEDIA_CHANGE=1",
[ilog2(DISK_EVENT_EJECT_REQUEST)] = "DISK_EJECT_REQUEST=1",
};
/* list of all disk_events */
static DEFINE_MUTEX(disk_events_mutex);
static LIST_HEAD(disk_events);
/* disable in-kernel polling by default */
static unsigned long disk_events_dfl_poll_msecs;
static unsigned long disk_events_poll_jiffies(struct gendisk *disk)
{
struct disk_events *ev = disk->ev;
long intv_msecs = 0;
/*
* If device-specific poll interval is set, always use it. If
* the default is being used, poll iff there are events which
* can't be monitored asynchronously.
*/
if (ev->poll_msecs >= 0)
intv_msecs = ev->poll_msecs;
else if (disk->events & ~disk->async_events)
intv_msecs = disk_events_dfl_poll_msecs;
return msecs_to_jiffies(intv_msecs);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 44 | 69.84% | 1 | 33.33% |
kay sievers | kay sievers | 19 | 30.16% | 2 | 66.67% |
| Total | 63 | 100.00% | 3 | 100.00% |
/**
* disk_block_events - block and flush disk event checking
* @disk: disk to block events for
*
* On return from this function, it is guaranteed that event checking
* isn't in progress and won't happen until unblocked by
* disk_unblock_events(). Events blocking is counted and the actual
* unblocking happens after the matching number of unblocks are done.
*
* Note that this intentionally does not block event checking from
* disk_clear_events().
*
* CONTEXT:
* Might sleep.
*/
void disk_block_events(struct gendisk *disk)
{
struct disk_events *ev = disk->ev;
unsigned long flags;
bool cancel;
if (!ev)
return;
/*
* Outer mutex ensures that the first blocker completes canceling
* the event work before further blockers are allowed to finish.
*/
mutex_lock(&ev->block_mutex);
spin_lock_irqsave(&ev->lock, flags);
cancel = !ev->block++;
spin_unlock_irqrestore(&ev->lock, flags);
if (cancel)
cancel_delayed_work_sync(&disk->ev->dwork);
mutex_unlock(&ev->block_mutex);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 78 | 85.71% | 6 | 75.00% |
andrew morton | andrew morton | 10 | 10.99% | 1 | 12.50% |
jerome marchand | jerome marchand | 3 | 3.30% | 1 | 12.50% |
| Total | 91 | 100.00% | 8 | 100.00% |
static void __disk_unblock_events(struct gendisk *disk, bool check_now)
{
struct disk_events *ev = disk->ev;
unsigned long intv;
unsigned long flags;
spin_lock_irqsave(&ev->lock, flags);
if (WARN_ON_ONCE(ev->block <= 0))
goto out_unlock;
if (--ev->block)
goto out_unlock;
/*
* Not exactly a latency critical operation, set poll timer
* slack to 25% and kick event check.
*/
intv = disk_events_poll_jiffies(disk);
set_timer_slack(&ev->dwork.timer, intv / 4);
if (check_now)
queue_delayed_work(system_freezable_power_efficient_wq,
&ev->dwork, 0);
else if (intv)
queue_delayed_work(system_freezable_power_efficient_wq,
&ev->dwork, intv);
out_unlock:
spin_unlock_irqrestore(&ev->lock, flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 111 | 84.09% | 2 | 33.33% |
jerome marchand | jerome marchand | 14 | 10.61% | 1 | 16.67% |
andrew morton | andrew morton | 3 | 2.27% | 1 | 16.67% |
viresh kumar | viresh kumar | 2 | 1.52% | 1 | 16.67% |
nikanth karthikesan | nikanth karthikesan | 2 | 1.52% | 1 | 16.67% |
| Total | 132 | 100.00% | 6 | 100.00% |
/**
* disk_unblock_events - unblock disk event checking
* @disk: disk to unblock events for
*
* Undo disk_block_events(). When the block count reaches zero, it
* starts events polling if configured.
*
* CONTEXT:
* Don't care. Safe to call from irq context.
*/
void disk_unblock_events(struct gendisk *disk)
{
if (disk->ev)
__disk_unblock_events(disk, false);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 14 | 60.87% | 2 | 66.67% |
alexey dobriyan | alexey dobriyan | 9 | 39.13% | 1 | 33.33% |
| Total | 23 | 100.00% | 3 | 100.00% |
/**
* disk_flush_events - schedule immediate event checking and flushing
* @disk: disk to check and flush events for
* @mask: events to flush
*
* Schedule immediate event checking on @disk if not blocked. Events in
* @mask are scheduled to be cleared from the driver. Note that this
* doesn't clear the events from @disk->ev.
*
* CONTEXT:
* If @mask is non-zero must be called with bdev->bd_mutex held.
*/
void disk_flush_events(struct gendisk *disk, unsigned int mask)
{
struct disk_events *ev = disk->ev;
if (!ev)
return;
spin_lock_irq(&ev->lock);
ev->clearing |= mask;
if (!ev->block)
mod_delayed_work(system_freezable_power_efficient_wq,
&ev->dwork, 0);
spin_unlock_irq(&ev->lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 67 | 95.71% | 4 | 66.67% |
alexey dobriyan | alexey dobriyan | 2 | 2.86% | 1 | 16.67% |
viresh kumar | viresh kumar | 1 | 1.43% | 1 | 16.67% |
| Total | 70 | 100.00% | 6 | 100.00% |
/**
* disk_clear_events - synchronously check, clear and return pending events
* @disk: disk to fetch and clear events from
* @mask: mask of events to be fetched and cleared
*
* Disk events are synchronously checked and pending events in @mask
* are cleared and returned. This ignores the block count.
*
* CONTEXT:
* Might sleep.
*/
unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask)
{
const struct block_device_operations *bdops = disk->fops;
struct disk_events *ev = disk->ev;
unsigned int pending;
unsigned int clearing = mask;
if (!ev) {
/* for drivers still using the old ->media_changed method */
if ((mask & DISK_EVENT_MEDIA_CHANGE) &&
bdops->media_changed && bdops->media_changed(disk))
return DISK_EVENT_MEDIA_CHANGE;
return 0;
}
disk_block_events(disk);
/*
* store the union of mask and ev->clearing on the stack so that the
* race with disk_flush_events does not cause ambiguity (ev->clearing
* can still be modified even if events are blocked).
*/
spin_lock_irq(&ev->lock);
clearing |= ev->clearing;
ev->clearing = 0;
spin_unlock_irq(&ev->lock);
disk_check_events(ev, &clearing);
/*
* if ev->clearing is not 0, the disk_flush_events got called in the
* middle of this function, so we want to run the workfn without delay.
*/
__disk_unblock_events(disk, ev->clearing ? true : false);
/* then, fetch and clear pending events */
spin_lock_irq(&ev->lock);
pending = ev->pending & mask;
ev->pending &= ~mask;
spin_unlock_irq(&ev->lock);
WARN_ON_ONCE(clearing & mask);
return pending;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 122 | 69.71% | 1 | 25.00% |
derek basehore | derek basehore | 36 | 20.57% | 1 | 25.00% |
alexey dobriyan | alexey dobriyan | 17 | 9.71% | 2 | 50.00% |
| Total | 175 | 100.00% | 4 | 100.00% |
/*
* Separate this part out so that a different pointer for clearing_ptr can be
* passed in for disk_clear_events.
*/
static void disk_events_workfn(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct disk_events *ev = container_of(dwork, struct disk_events, dwork);
disk_check_events(ev, &ev->clearing);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
kristen carlson accardi | kristen carlson accardi | 19 | 41.30% | 1 | 33.33% |
tejun heo | tejun heo | 16 | 34.78% | 1 | 33.33% |
derek basehore | derek basehore | 11 | 23.91% | 1 | 33.33% |
| Total | 46 | 100.00% | 3 | 100.00% |
static void disk_check_events(struct disk_events *ev,
unsigned int *clearing_ptr)
{
struct gendisk *disk = ev->disk;
char *envp[ARRAY_SIZE(disk_uevents) + 1] = { };
unsigned int clearing = *clearing_ptr;
unsigned int events;
unsigned long intv;
int nr_events = 0, i;
/* check events */
events = disk->fops->check_events(disk, clearing);
/* accumulate pending events and schedule next poll if necessary */
spin_lock_irq(&ev->lock);
events &= ~ev->pending;
ev->pending |= events;
*clearing_ptr &= ~clearing;
intv = disk_events_poll_jiffies(disk);
if (!ev->block && intv)
queue_delayed_work(system_freezable_power_efficient_wq,
&ev->dwork, intv);
spin_unlock_irq(&ev->lock);
/*
* Tell userland about new events. Only the events listed in
* @disk->events are reported. Unlisted events are processed the
* same internally but never get reported to userland.
*/
for (i = 0; i < ARRAY_SIZE(disk_uevents); i++)
if (events & disk->events & (1 << i))
envp[nr_events++] = disk_uevents[i];
if (nr_events)
kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 161 | 80.50% | 3 | 50.00% |
derek basehore | derek basehore | 19 | 9.50% | 1 | 16.67% |
kristen carlson accardi | kristen carlson accardi | 19 | 9.50% | 1 | 16.67% |
viresh kumar | viresh kumar | 1 | 0.50% | 1 | 16.67% |
| Total | 200 | 100.00% | 6 | 100.00% |
/*
* A disk events enabled device has the following sysfs nodes under
* its /sys/block/X/ directory.
*
* events : list of all supported events
* events_async : list of events which can be detected w/o polling
* events_poll_msecs : polling interval, 0: disable, -1: system default
*/
static ssize_t __disk_events_show(unsigned int events, char *buf)
{
const char *delim = "";
ssize_t pos = 0;
int i;
for (i = 0; i < ARRAY_SIZE(disk_events_strs); i++)
if (events & (1 << i)) {
pos += sprintf(buf + pos, "%s%s",
delim, disk_events_strs[i]);
delim = " ";
}
if (pos)
pos += sprintf(buf + pos, "\n");
return pos;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 83 | 85.57% | 2 | 66.67% |
greg kroah-hartman | greg kroah-hartman | 14 | 14.43% | 1 | 33.33% |
| Total | 97 | 100.00% | 3 | 100.00% |
static ssize_t disk_events_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
return __disk_events_show(disk->events, buf);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 30 | 75.00% | 2 | 40.00% |
neil brown | neil brown | 5 | 12.50% | 1 | 20.00% |
kay sievers | kay sievers | 5 | 12.50% | 2 | 40.00% |
| Total | 40 | 100.00% | 5 | 100.00% |
static ssize_t disk_events_async_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
return __disk_events_show(disk->async_events, buf);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 38 | 95.00% | 4 | 80.00% |
kay sievers | kay sievers | 2 | 5.00% | 1 | 20.00% |
| Total | 40 | 100.00% | 5 | 100.00% |
static ssize_t disk_events_poll_msecs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
return sprintf(buf, "%ld\n", disk->ev->poll_msecs);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 34 | 77.27% | 1 | 33.33% |
christoph lameter | christoph lameter | 6 | 13.64% | 1 | 33.33% |
al viro | al viro | 4 | 9.09% | 1 | 33.33% |
| Total | 44 | 100.00% | 3 | 100.00% |
static ssize_t disk_events_poll_msecs_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct gendisk *disk = dev_to_disk(dev);
long intv;
if (!count || !sscanf(buf, "%ld", &intv))
return -EINVAL;
if (intv < 0 && intv != -1)
return -EINVAL;
disk_block_events(disk);
disk->ev->poll_msecs = intv;
__disk_unblock_events(disk, true);
return count;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 65 | 68.42% | 6 | 50.00% |
al viro | al viro | 15 | 15.79% | 2 | 16.67% |
andrew morton | andrew morton | 6 | 6.32% | 1 | 8.33% |
jerome marchand | jerome marchand | 4 | 4.21% | 1 | 8.33% |
greg kroah-hartman | greg kroah-hartman | 4 | 4.21% | 1 | 8.33% |
patrick mochel | patrick mochel | 1 | 1.05% | 1 | 8.33% |
| Total | 95 | 100.00% | 12 | 100.00% |
static const DEVICE_ATTR(events, S_IRUGO, disk_events_show, NULL);
static const DEVICE_ATTR(events_async, S_IRUGO, disk_events_async_show, NULL);
static const DEVICE_ATTR(events_poll_msecs, S_IRUGO|S_IWUSR,
disk_events_poll_msecs_show,
disk_events_poll_msecs_store);
static const struct attribute *disk_events_attrs[] = {
&dev_attr_events.attr,
&dev_attr_events_async.attr,
&dev_attr_events_poll_msecs.attr,
NULL,
};
/*
* The default polling interval can be specified by the kernel
* parameter block.events_dfl_poll_msecs which defaults to 0
* (disable). This can also be modified runtime by writing to
* /sys/module/block/events_dfl_poll_msecs.
*/
static int disk_events_set_dfl_poll_msecs(const char *val,
const struct kernel_param *kp)
{
struct disk_events *ev;
int ret;
ret = param_set_ulong(val, kp);
if (ret < 0)
return ret;
mutex_lock(&disk_events_mutex);
list_for_each_entry(ev, &disk_events, node)
disk_flush_events(ev->disk, 0);
mutex_unlock(&disk_events_mutex);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 48 | 64.00% | 3 | 42.86% |
al viro | al viro | 20 | 26.67% | 2 | 28.57% |
andrew morton | andrew morton | 6 | 8.00% | 1 | 14.29% |
patrick mochel | patrick mochel | 1 | 1.33% | 1 | 14.29% |
| Total | 75 | 100.00% | 7 | 100.00% |
static const struct kernel_param_ops disk_events_dfl_poll_msecs_param_ops = {
.set = disk_events_set_dfl_poll_msecs,
.get = param_get_ulong,
};
#undef MODULE_PARAM_PREFIX
#define MODULE_PARAM_PREFIX "block."
module_param_cb(events_dfl_poll_msecs, &disk_events_dfl_poll_msecs_param_ops,
&disk_events_dfl_poll_msecs, 0644);
/*
* disk_{alloc|add|del|release}_events - initialize and destroy disk_events.
*/
static void disk_alloc_events(struct gendisk *disk)
{
struct disk_events *ev;
if (!disk->fops->check_events)
return;
ev = kzalloc(sizeof(*ev), GFP_KERNEL);
if (!ev) {
pr_warn("%s: failed to initialize events\n", disk->disk_name);
return;
}
INIT_LIST_HEAD(&ev->node);
ev->disk = disk;
spin_lock_init(&ev->lock);
mutex_init(&ev->block_mutex);
ev->block = 1;
ev->poll_msecs = -1;
INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn);
disk->ev = ev;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 84 | 73.04% | 4 | 44.44% |
hannes reinecke | hannes reinecke | 14 | 12.17% | 1 | 11.11% |
stanislaw gruszka | stanislaw gruszka | 8 | 6.96% | 1 | 11.11% |
al viro | al viro | 5 | 4.35% | 1 | 11.11% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 3 | 2.61% | 1 | 11.11% |
andrew morton | andrew morton | 1 | 0.87% | 1 | 11.11% |
| Total | 115 | 100.00% | 9 | 100.00% |
static void disk_add_events(struct gendisk *disk)
{
if (!disk->ev)
return;
/* FIXME: error handling */
if (sysfs_create_files(&disk_to_dev(disk)->kobj, disk_events_attrs) < 0)
pr_warn("%s: failed to create sysfs files for events\n",
disk->disk_name);
mutex_lock(&disk_events_mutex);
list_add_tail(&disk->ev->node, &disk_events);
mutex_unlock(&disk_events_mutex);
/*
* Block count is initialized to 1 and the following initial
* unblock kicks it into action.
*/
__disk_unblock_events(disk, true);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
stanislaw gruszka | stanislaw gruszka | 47 | 59.49% | 1 | 33.33% |
tejun heo | tejun heo | 29 | 36.71% | 1 | 33.33% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 3 | 3.80% | 1 | 33.33% |
| Total | 79 | 100.00% | 3 | 100.00% |
static void disk_del_events(struct gendisk *disk)
{
if (!disk->ev)
return;
disk_block_events(disk);
mutex_lock(&disk_events_mutex);
list_del_init(&disk->ev->node);
mutex_unlock(&disk_events_mutex);
sysfs_remove_files(&disk_to_dev(disk)->kobj, disk_events_attrs);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 45 | 76.27% | 2 | 50.00% |
al viro | al viro | 11 | 18.64% | 1 | 25.00% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 3 | 5.08% | 1 | 25.00% |
| Total | 59 | 100.00% | 4 | 100.00% |
static void disk_release_events(struct gendisk *disk)
{
/* the block count should be 1 from disk_del_events() */
WARN_ON_ONCE(disk->ev && disk->ev->block != 1);
kfree(disk->ev);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 19 | 55.88% | 1 | 33.33% |
al viro | al viro | 14 | 41.18% | 1 | 33.33% |
andrew morton | andrew morton | 1 | 2.94% | 1 | 33.33% |
| Total | 34 | 100.00% | 3 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
tejun heo | tejun heo | 3777 | 49.79% | 36 | 18.18% |
andrew morton | andrew morton | 698 | 9.20% | 16 | 8.08% |
al viro | al viro | 544 | 7.17% | 25 | 12.63% |
kay sievers | kay sievers | 484 | 6.38% | 11 | 5.56% |
jens axboe | jens axboe | 179 | 2.36% | 6 | 3.03% |
alexey dobriyan | alexey dobriyan | 164 | 2.16% | 2 | 1.01% |
martin k. petersen | martin k. petersen | 156 | 2.06% | 4 | 2.02% |
greg kroah-hartman | greg kroah-hartman | 140 | 1.85% | 10 | 5.05% |
vishal verma | vishal verma | 139 | 1.83% | 1 | 0.51% |
jerome marchand | jerome marchand | 114 | 1.50% | 3 | 1.52% |
patrick mochel | patrick mochel | 83 | 1.09% | 5 | 2.53% |
derek basehore | derek basehore | 82 | 1.08% | 1 | 0.51% |
linus torvalds | linus torvalds | 79 | 1.04% | 5 | 2.53% |
kristen carlson accardi | kristen carlson accardi | 75 | 0.99% | 2 | 1.01% |
david alan gilbert | david alan gilbert | 74 | 0.98% | 1 | 0.51% |
stanislaw gruszka | stanislaw gruszka | 71 | 0.94% | 1 | 0.51% |
hannes reinecke | hannes reinecke | 68 | 0.90% | 1 | 0.51% |
dave jones | dave jones | 67 | 0.88% | 1 | 0.51% |
peter zijlstra | peter zijlstra | 43 | 0.57% | 1 | 0.51% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 41 | 0.54% | 1 | 0.51% |
neil brown | neil brown | 40 | 0.53% | 2 | 1.01% |
joe korty | joe korty | 38 | 0.50% | 1 | 0.51% |
akinobu mita | akinobu mita | 29 | 0.38% | 3 | 1.52% |
christoph lameter | christoph lameter | 28 | 0.37% | 1 | 0.51% |
olaf hering | olaf hering | 27 | 0.36% | 1 | 0.51% |
keith busch | keith busch | 25 | 0.33% | 1 | 0.51% |
nikanth karthikesan | nikanth karthikesan | 24 | 0.32% | 1 | 0.51% |
pre-git | pre-git | 23 | 0.30% | 6 | 3.03% |
vivek goyal | vivek goyal | 23 | 0.30% | 1 | 0.51% |
lei ming | lei ming | 21 | 0.28% | 2 | 1.01% |
ming lei | ming lei | 21 | 0.28% | 1 | 0.51% |
will drewry | will drewry | 20 | 0.26% | 2 | 1.01% |
jan kara | jan kara | 20 | 0.26% | 1 | 0.51% |
dan williams | dan williams | 18 | 0.24% | 2 | 1.01% |
roland mcgrath | roland mcgrath | 12 | 0.16% | 1 | 0.51% |
stephen warren | stephen warren | 11 | 0.15% | 1 | 0.51% |
rusty russell | rusty russell | 11 | 0.15% | 2 | 1.01% |
yanmin zhang | yanmin zhang | 10 | 0.13% | 1 | 0.51% |
christoph hellwig | christoph hellwig | 10 | 0.13% | 3 | 1.52% |
adrian bunk | adrian bunk | 9 | 0.12% | 3 | 1.52% |
andi kleen | andi kleen | 9 | 0.12% | 1 | 0.51% |
art haas | art haas | 8 | 0.11% | 1 | 0.51% |
tomas henzl | tomas henzl | 8 | 0.11% | 1 | 0.51% |
liu yuan | liu yuan | 8 | 0.11% | 1 | 0.51% |
jes sorensen | jes sorensen | 7 | 0.09% | 1 | 0.51% |
neil horman | neil horman | 6 | 0.08% | 1 | 0.51% |
cheng renquan | cheng renquan | 6 | 0.08% | 1 | 0.51% |
randy dunlap | randy dunlap | 5 | 0.07% | 3 | 1.52% |
viresh kumar | viresh kumar | 4 | 0.05% | 1 | 0.51% |
divyesh shah | divyesh shah | 4 | 0.05% | 1 | 0.51% |
jan engelhardt | jan engelhardt | 2 | 0.03% | 1 | 0.51% |
harvey harrison | harvey harrison | 2 | 0.03% | 1 | 0.51% |
herbert poetzl | herbert poetzl | 2 | 0.03% | 1 | 0.51% |
lai jiangshan | lai jiangshan | 2 | 0.03% | 1 | 0.51% |
anton blanchard | anton blanchard | 2 | 0.03% | 1 | 0.51% |
kees cook | kees cook | 2 | 0.03% | 1 | 0.51% |
masanari iida | masanari iida | 1 | 0.01% | 1 | 0.51% |
david brownell | david brownell | 1 | 0.01% | 1 | 0.51% |
mika kukkonen | mika kukkonen | 1 | 0.01% | 1 | 0.51% |
joe perches | joe perches | 1 | 0.01% | 1 | 0.51% |
andries brouwer | andries brouwer | 1 | 0.01% | 1 | 0.51% |
ezequiel garcia | ezequiel garcia | 1 | 0.01% | 1 | 0.51% |
ben collins | ben collins | 1 | 0.01% | 1 | 0.51% |
lucas de marchi | lucas de marchi | 1 | 0.01% | 1 | 0.51% |
yang zhang | yang zhang | 1 | 0.01% | 1 | 0.51% |
marton nemeth | marton nemeth | 1 | 0.01% | 1 | 0.51% |
li zefan | li zefan | 1 | 0.01% | 1 | 0.51% |
| Total | 7586 | 100.00% | 198 | 100.00% |
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