cregit-Linux how code gets into the kernel

Release 4.13 block/genhd.c

Directory: block
/*
 *  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 const 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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Tejun Heo94100.00%4100.00%
Total94100.00%4100.00%

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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Tejun Heo97100.00%4100.00%
Total97100.00%4100.00%

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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Tejun Heo20498.55%583.33%
Vivek Goyal31.45%116.67%
Total207100.00%6100.00%

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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Tejun Heo23100.00%1100.00%
Total23100.00%1100.00%

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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Jens Axboe3090.91%150.00%
Vivek Goyal39.09%150.00%
Total33100.00%2100.00%

/** * 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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Tejun Heo7663.33%480.00%
Jens Axboe4436.67%120.00%
Total120100.00%5100.00%

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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Andrew Morton1386.67%133.33%
Joe Korty16.67%133.33%
Yang Zhang16.67%133.33%
Total15100.00%3100.00%

#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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Joe Korty3245.71%114.29%
Neil Horman2434.29%114.29%
Andrew Morton68.57%114.29%
Al Viro34.29%114.29%
Tejun Heo22.86%114.29%
Kay Sievers22.86%114.29%
Jes Sorensen11.43%114.29%
Total70100.00%7100.00%

#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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Andrew Morton25197.67%342.86%
Kay Sievers20.78%114.29%
Jes Sorensen20.78%114.29%
Mika Kukkonen10.39%114.29%
Benjamin Collins10.39%114.29%
Total257100.00%7100.00%

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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PersonTokensPropCommitsCommitProp
Andrew Morton11086.61%228.57%
Akinobu Mita86.30%228.57%
Christoph Hellwig53.94%114.29%
Jes Sorensen21.57%114.29%
Kay Sievers21.57%114.29%
Total127100.00%7100.00%

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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Tejun Heo99100.00%1100.00%
Total99100.00%1100.00%

/** * 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 Heo11083.97%457.14%
Keith Busch118.40%114.29%
Tomas Henzl86.11%114.29%
Dan J Williams21.53%114.29%
Total131100.00%7100.00%

/** * 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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Tejun Heo5392.98%250.00%
Dan J Williams23.51%125.00%
Keith Busch23.51%125.00%
Total57100.00%4100.00%


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 Heo91100.00%1100.00%
Total91100.00%1100.00%

/* * 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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Al Viro1990.48%266.67%
Kay Sievers29.52%133.33%
Total21100.00%3100.00%

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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Al Viro3085.71%350.00%
Tejun Heo411.43%233.33%
Kay Sievers12.86%116.67%
Total35100.00%6100.00%


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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Al Viro3497.14%266.67%
Kay Sievers12.86%133.33%
Total35100.00%3100.00%


static void register_disk(struct device *parent, 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 = parent; 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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PersonTokensPropCommitsCommitProp
Tejun Heo22176.47%526.32%
Al Viro206.92%526.32%
Linus Torvalds93.11%210.53%
Peter Zijlstra93.11%15.26%
Ming Lei82.77%15.26%
Dan J Williams62.08%15.26%
Jan Kara62.08%15.26%
Greg Kroah-Hartman51.73%15.26%
Jens Axboe31.04%15.26%
Kees Cook20.69%15.26%
Total289100.00%19100.00%

/** * device_add_disk - add partitioning information to kernel list * @parent: parent device for the disk * @disk: per-device partitioning information * * This function registers the partitioning information in @disk * with the kernel. * * FIXME: error handling */
void device_add_disk(struct device *parent, 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_owner(bdi, disk_to_dev(disk)); blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk); register_disk(parent, 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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PersonTokensPropCommitsCommitProp
Tejun Heo9843.36%628.57%
Al Viro3615.93%419.05%
Peter Zijlstra3515.49%14.76%
Linus Torvalds114.87%29.52%
Dan J Williams104.42%29.52%
Greg Kroah-Hartman104.42%14.76%
Jens Axboe83.54%14.76%
Jan Kara73.10%14.76%
Martin K. Petersen52.21%14.76%
Stanislaw Gruszka52.21%14.76%
Andrew Morton10.44%14.76%
Total226100.00%21100.00%

EXPORT_SYMBOL(device_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); bdev_unhash_inode(part_devt(part)); delete_partition(disk, part->partno); } disk_part_iter_exit(&piter); invalidate_partition(disk, 0); bdev_unhash_inode(disk_devt(disk)); set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); if (disk->queue) { /* * Unregister bdi before releasing device numbers (as they can * get reused and we'd get clashes in sysfs). */ bdi_unregister(disk->queue->backing_dev_info); blk_unregister_queue(disk); } else { WARN_ON(1); } 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)); }

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PersonTokensPropCommitsCommitProp
Tejun Heo14559.67%526.32%
Jan Kara4719.34%526.32%
Linus Torvalds124.94%210.53%
Ming Lei104.12%15.26%
Peter Zijlstra104.12%15.26%
Al Viro93.70%210.53%
Martin K. Petersen52.06%15.26%
Jens Axboe41.65%15.26%
Andrew Morton10.41%15.26%
Total243100.00%19100.00%

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); }

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Vishal Verma57100.00%1100.00%
Total57100.00%1100.00%


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); }

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PersonTokensPropCommitsCommitProp
Vishal Verma59100.00%1100.00%
Total59100.00%1100.00%

/** * 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; }

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PersonTokensPropCommitsCommitProp
Tejun Heo9372.09%321.43%
Al Viro1612.40%750.00%
Linus Torvalds96.98%17.14%
Kay Sievers75.43%17.14%
Keith Busch21.55%17.14%
Dan J Williams21.55%17.14%
Total129100.00%14100.00%

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; }

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Tejun Heo58100.00%3100.00%
Total58100.00%3100.00%

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 (dev->parent && dev->parent->driver) printk(" driver: %s\n", dev->parent->driver->name); else printk(" (driver?)\n"); } else printk("\n"); } disk_part_iter_exit(&piter); } class_dev_iter_exit(&iter); }

Contributors

PersonTokensPropCommitsCommitProp
Tejun Heo13355.19%538.46%
David Alan Gilbert7129.46%17.69%
Stephen Warren114.56%17.69%
Kay Sievers93.73%17.69%
Dan J Williams62.49%17.69%
Greg Kroah-Hartman52.07%17.69%
Vivek Goyal31.24%17.69%
Will Drewry20.83%17.69%
Lucas De Marchi10.41%17.69%
Total241100.00%13100.00%

#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

PersonTokensPropCommitsCommitProp
Tejun Heo7873.58%125.00%
Greg Kroah-Hartman2523.58%125.00%
Harvey Harrison21.89%125.00%
Kay Sievers10.94%125.00%
Total106100.00%4100.00%


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

PersonTokensPropCommitsCommitProp
Tejun Heo1528.30%225.00%
Dave Jones1426.42%112.50%
Kay Sievers1018.87%112.50%
Linus Torvalds611.32%112.50%
Al Viro47.55%112.50%
Greg Kroah-Hartman47.55%225.00%
Total53100.00%8100.00%


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); seqf->private = NULL; } }

Contributors

PersonTokensPropCommitsCommitProp
Tejun Heo2859.57%133.33%
Greg Kroah-Hartman1327.66%133.33%
Vegard Nossum612.77%133.33%
Total47100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Tejun Heo2141.18%225.00%
Dave Jones1325.49%112.50%
Kay Sievers917.65%225.00%
Greg Kroah-Hartman47.84%112.50%
Al Viro35.88%112.50%
Yang Zhang11.96%112.50%
Total51100.00%8100.00%


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

PersonTokensPropCommitsCommitProp
Tejun Heo5636.36%631.58%
Dave Jones3019.48%15.26%
Andrew Morton2918.83%421.05%
Linus Torvalds2918.83%210.53%
Al Viro53.25%315.79%
Vivek Goyal31.95%15.26%
Andries E. Brouwer10.65%15.26%
Rusty Russell10.65%15.26%
Total154100.00%19100.00%

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

PersonTokensPropCommitsCommitProp
Alexey Dobriyan25100.00%1100.00%
Total25100.00%1100.00%

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

PersonTokensPropCommitsCommitProp
Al Viro2853.85%233.33%
Andrew Morton1834.62%116.67%
Kay Sievers47.69%116.67%
Tejun Heo11.92%116.67%
Linus Torvalds11.92%116.67%
Total52100.00%6100.00%


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

PersonTokensPropCommitsCommitProp
Al Viro1216.22%318.75%
Roland McGrath1216.22%16.25%
Dan J Williams1013.51%16.25%
Kay Sievers912.16%16.25%
Linus Torvalds (pre-git)912.16%425.00%
Yanmin Zhang79.46%16.25%
Greg Kroah-Hartman56.76%16.25%
Andi Kleen56.76%16.25%
Anton Blanchard22.70%16.25%
Linus Torvalds22.70%16.25%
Randy Dunlap11.35%16.25%
Total74100.00%16100.00%

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

PersonTokensPropCommitsCommitProp
Patrick Mochel2969.05%266.67%
Kay Sievers1330.95%133.33%
Total42100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Tejun Heo43100.00%1100.00%
Total43100.00%1100.00%


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

PersonTokensPropCommitsCommitProp
Kay Sievers2244.00%250.00%
Olaf Hering1938.00%125.00%
Patrick Mochel918.00%125.00%
Total50100.00%4100.00%


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

PersonTokensPropCommitsCommitProp
Kay Sievers4493.62%150.00%
Tejun Heo36.38%150.00%
Total47100.00%2100.00%


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

PersonTokensPropCommitsCommitProp
Kristen Carlson Accardi2252.38%150.00%
Kay Sievers2047.62%150.00%
Total42100.00%2100.00%


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

PersonTokensPropCommitsCommitProp
Martin K. Petersen45100.00%1100.00%
Total45100.00%1100.00%


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

PersonTokensPropCommitsCommitProp
Martin K. Petersen45100.00%2100.00%
Total45100.00%2100.00%

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 umode_t disk_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, typeof(*dev), kobj); struct gendisk *disk = dev_to_disk(dev); if (a == &dev_attr_badblocks.attr && !disk->bb) return 0; return a->mode; }

Contributors

PersonTokensPropCommitsCommitProp
Dan J Williams69100.00%1100.00%
Total69100.00%1100.00%

static struct attribute_group disk_attr_group = { .attrs = disk_attrs, .is_visible = disk_visible, }; 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

PersonTokensPropCommitsCommitProp
Tejun Heo4376.79%133.33%
Jens Axboe1119.64%133.33%
Lai Jiangshan23.57%133.33%
Total56100.00%3100.00%

/** * 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

PersonTokensPropCommitsCommitProp
Tejun Heo16089.39%150.00%
Jens Axboe1910.61%150.00%
Total179100.00%2100.00%


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

PersonTokensPropCommitsCommitProp
Tejun Heo3345.21%436.36%
Kay Sievers1926.03%218.18%
Keith Busch79.59%19.09%
Will Drewry79.59%19.09%
Andrew Morton45.48%19.09%
Greg Kroah-Hartman22.74%19.09%
Lei Ming11.37%19.09%
Total73100.00%11100.00%

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

PersonTokensPropCommitsCommitProp
Kay Sievers5094.34%360.00%
Greg Kroah-Hartman23.77%120.00%
Al Viro11.89%120.00%
Total53100.00%5100.00%

static const 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

PersonTokensPropCommitsCommitProp
Jerome Marchand8937.87%17.14%
Tejun Heo6326.81%750.00%
Andrew Morton5724.26%17.14%
Jens Axboe125.11%17.14%
Liu Yuan83.40%17.14%
Nikanth Karthikesan31.28%17.14%
Herbert Pötzl20.85%17.14%
Rusty Russell10.43%17.14%
Total235100.00%14100.00%

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

PersonTokensPropCommitsCommitProp
Alexey Dobriyan25100.00%1100.00%
Total25100.00%1100.00%

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

PersonTokensPropCommitsCommitProp
Alexey Dobriyan36100.00%2100.00%
Total36100.00%2100.00%

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

PersonTokensPropCommitsCommitProp
Tejun Heo8049.08%541.67%
Neil Brown3320.25%18.33%
Greg Kroah-Hartman3018.40%18.33%
Kay Sievers148.59%433.33%
Kristen Carlson Accardi63.68%18.33%
Total163100.00%12100.00%

EXPORT_SYMBOL(blk_lookup_devt);
struct gendisk *alloc_disk(int minors) { return alloc_disk_node(minors, NUMA_NO_NODE); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro950.00%250.00%
Christoph Lameter844.44%125.00%
Ezequiel García15.56%125.00%
Total18100.00%4100.00%

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

PersonTokensPropCommitsCommitProp
Tejun Heo4825.53%626.09%
Al Viro4725.00%417.39%
Lei Ming2010.64%14.35%
Andrew Morton157.98%14.35%
Kay Sievers115.85%14.35%
Vivek Goyal115.85%14.35%
Jerome Marchand115.85%28.70%
Greg Kroah-Hartman73.72%14.35%
Cheng Renquan63.19%14.35%
Christoph Lameter63.19%14.35%
Patrick Mochel42.13%28.70%
Joe Perches10.53%14.35%
Jens Axboe10.53%14.35%
Total188100.00%23100.00%

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_unless_zero(&disk_to_dev(disk)->kobj); if (kobj == NULL) { module_put(owner); return NULL; } return kobj; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro5261.18%337.50%
Andrew Morton2630.59%112.50%
Tejun Heo33.53%112.50%
Patrick Mochel22.35%112.50%
Jan Kara11.18%112.50%
Christoph Hellwig11.18%112.50%
Total85100.00%8100.00%

EXPORT_SYMBOL(get_disk);
void put_disk(struct gendisk *disk) { if (disk) kobject_put(&disk_to_dev(disk)->kobj); }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro2080.00%360.00%
Tejun Heo312.00%120.00%
Patrick Mochel28.00%120.00%
Total25100.00%5100.00%

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

PersonTokensPropCommitsCommitProp
Hannes Reinecke58100.00%1100.00%
Total58100.00%1100.00%


void set_device_ro(struct block_device *bdev, int flag) { bdev->bd_part->policy = flag; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro21100.00%2100.00%
Total21100.00%2100.00%

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

PersonTokensPropCommitsCommitProp
Tejun Heo3238.55%240.00%
Hannes Reinecke2732.53%120.00%
Al Viro2024.10%120.00%
Andrew Morton44.82%120.00%
Total83100.00%5100.00%

EXPORT_SYMBOL(set_disk_ro);
int bdev_read_only(struct block_device *bdev) { if (!bdev) return 0; return bdev->bd_part->policy; }

Contributors

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Al Viro25100.00%2100.00%
Total25100.00%2100.00%

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; }

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PersonTokensPropCommitsCommitProp
Al Viro4781.03%120.00%
Christoph Hellwig58.62%120.00%
Neil Brown23.45%120.00%
Andrew Morton23.45%120.00%
Tejun Heo23.45%120.00%
Total58100.00%5100.00%

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); }

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PersonTokensPropCommitsCommitProp
Tejun Heo63100.00%1100.00%
Total63100.00%1100.00%

/** * 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); }

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Tejun Heo91100.00%3100.00%
Total91100.00%3100.00%


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; intv = disk_events_poll_jiffies(disk); 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); }

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PersonTokensPropCommitsCommitProp
Tejun Heo11598.29%150.00%
Viresh Kumar21.71%150.00%
Total117100.00%2100.00%

/** * 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); }

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PersonTokensPropCommitsCommitProp
Tejun Heo23100.00%2100.00%
Total23100.00%2100.00%

/** * 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); }

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PersonTokensPropCommitsCommitProp
Tejun Heo6998.57%480.00%
Viresh Kumar11.43%120.00%
Total70100.00%5100.00%

/** * 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; }

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PersonTokensPropCommitsCommitProp
Tejun Heo13979.43%150.00%
Derek Basehore3620.57%150.00%
Total175100.00%2100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Tejun Heo3576.09%150.00%
Derek Basehore1123.91%150.00%
Total46100.00%2100.00%


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); }

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PersonTokensPropCommitsCommitProp
Tejun Heo18090.00%250.00%
Derek Basehore199.50%125.00%
Viresh Kumar10.50%125.00%
Total200100.00%4100.00%

/* * 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; }

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PersonTokensPropCommitsCommitProp
Tejun Heo97100.00%1100.00%
Total97100.00%1100.00%


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); }

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PersonTokensPropCommitsCommitProp
Tejun Heo40100.00%1100.00%
Total40100.00%1100.00%


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); }

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Tejun Heo40100.00%1100.00%
Total40100.00%1100.00%


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); }

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PersonTokensPropCommitsCommitProp
Tejun Heo44100.00%1100.00%
Total44100.00%1100.00%


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; }

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PersonTokensPropCommitsCommitProp
Tejun Heo95100.00%2100.00%
Total95100.00%2100.00%

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; }

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PersonTokensPropCommitsCommitProp
Tejun Heo75100.00%2100.00%
Total75100.00%2100.00%

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

PersonTokensPropCommitsCommitProp
Tejun Heo10389.57%457.14%
Stanislaw Gruszka86.96%114.29%
Al Viro32.61%114.29%
Andrew Morton10.87%114.29%
Total115100.00%7100.00%


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

PersonTokensPropCommitsCommitProp
Stanislaw Gruszka4759.49%133.33%
Tejun Heo2936.71%133.33%
Arnaldo Carvalho de Melo33.80%133.33%
Total79100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Tejun Heo4576.27%250.00%
Al Viro1118.64%125.00%
Arnaldo Carvalho de Melo35.08%125.00%
Total59100.00%4100.00%


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

PersonTokensPropCommitsCommitProp
Tejun Heo1955.88%133.33%
Al Viro1441.18%133.33%
Andrew Morton12.94%133.33%
Total34100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Tejun Heo401252.10%3616.74%
Andrew Morton6358.25%167.44%
Al Viro5356.95%2612.09%
Kay Sievers3784.91%115.12%
Jens Axboe1692.19%62.79%
Alexey Dobriyan1521.97%20.93%
Vishal Verma1391.81%10.47%
Martin K. Petersen1341.74%41.86%
Greg Kroah-Hartman1231.60%115.12%
Dan J Williams1141.48%62.79%
Jerome Marchand1001.30%31.40%
Linus Torvalds971.26%52.33%
Hannes Reinecke851.10%10.47%
Derek Basehore821.06%10.47%
Patrick Mochel760.99%52.33%
Dave Jones760.99%10.47%
Stanislaw Gruszka710.92%10.47%
David Alan Gilbert710.92%10.47%
Jan Kara610.79%73.26%
Peter Zijlstra540.70%10.47%
Arnaldo Carvalho de Melo410.53%10.47%
Joe Korty400.52%10.47%
Neil Brown350.45%20.93%
Kristen Carlson Accardi320.42%20.93%
Akinobu Mita290.38%31.40%
Keith Busch250.32%10.47%
Neil Horman240.31%10.47%
Vivek Goyal230.30%10.47%
Linus Torvalds (pre-git)230.30%83.72%
Olaf Hering230.30%10.47%
Lei Ming210.27%20.93%
Ming Lei210.27%10.47%
Nikanth Karthikesan200.26%10.47%
Christoph Lameter190.25%10.47%
Christoph Hellwig130.17%31.40%
Roland McGrath120.16%10.47%
Stephen Warren110.14%10.47%
Rusty Russell100.13%20.93%
Adrian Bunk90.12%31.40%
Will Drewry90.12%20.93%
Liu Yuan80.10%10.47%
Tomas Henzl80.10%10.47%
Art Haas80.10%10.47%
Yanmin Zhang70.09%10.47%
Jes Sorensen70.09%10.47%
Vegard Nossum60.08%10.47%
Cheng Renquan60.08%10.47%
Randy Dunlap50.06%31.40%
Divyesh Shah50.06%10.47%
Andi Kleen50.06%10.47%
Viresh Kumar40.05%10.47%
Anton Blanchard30.04%10.47%
Jan Engelhardt20.03%10.47%
Kees Cook20.03%10.47%
Harvey Harrison20.03%10.47%
Yang Zhang20.03%20.93%
Herbert Pötzl20.03%10.47%
Lai Jiangshan20.03%10.47%
Bart Van Assche20.03%10.47%
Lucas De Marchi10.01%10.47%
Ezequiel García10.01%10.47%
Li Zefan10.01%10.47%
Benjamin Collins10.01%10.47%
David Brownell10.01%10.47%
Andries E. Brouwer10.01%10.47%
Masanari Iida10.01%10.47%
Joe Perches10.01%10.47%
Mika Kukkonen10.01%10.47%
Mauro Carvalho Chehab10.01%10.47%
Total7700100.00%215100.00%
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