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block/genhd.c
43 KB
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/* * gendisk handling */ |
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#include <linux/module.h> #include <linux/fs.h> #include <linux/genhd.h> |
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#include <linux/kdev_t.h> |
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#include <linux/kernel.h> #include <linux/blkdev.h> #include <linux/init.h> #include <linux/spinlock.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> #include <linux/slab.h> #include <linux/kmod.h> #include <linux/kobj_map.h> |
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#include <linux/mutex.h> |
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#include <linux/idr.h> |
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#include <linux/log2.h> |
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#include "blk.h" |
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static DEFINE_MUTEX(block_class_lock); |
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struct kobject *block_depr; |
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/* for extended dynamic devt allocation, currently only one major is used */ #define MAX_EXT_DEVT (1 << MINORBITS) /* For extended devt allocation. ext_devt_mutex prevents look up * results from going away underneath its user. */ static DEFINE_MUTEX(ext_devt_mutex); static DEFINE_IDR(ext_devt_idr); |
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static struct device_type disk_type; |
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static void disk_alloc_events(struct gendisk *disk); |
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static void disk_add_events(struct gendisk *disk); static void disk_del_events(struct gendisk *disk); static void disk_release_events(struct gendisk *disk); |
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/** * 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) { |
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struct hd_struct *part = NULL; struct disk_part_tbl *ptbl; |
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if (unlikely(partno < 0)) |
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return NULL; |
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rcu_read_lock(); |
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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)); } |
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rcu_read_unlock(); return part; } EXPORT_SYMBOL_GPL(disk_get_part); /** * disk_part_iter_init - initialize partition iterator * @piter: iterator to initialize * @disk: disk to iterate over * @flags: DISK_PITER_* flags * * Initialize @piter so that it iterates over partitions of @disk. * * CONTEXT: * Don't care. */ void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, unsigned int flags) { |
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struct disk_part_tbl *ptbl; rcu_read_lock(); ptbl = rcu_dereference(disk->part_tbl); |
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piter->disk = disk; piter->part = NULL; if (flags & DISK_PITER_REVERSE) |
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piter->idx = ptbl->len - 1; |
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else if (flags & (DISK_PITER_INCL_PART0 | DISK_PITER_INCL_EMPTY_PART0)) |
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piter->idx = 0; |
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else piter->idx = 1; |
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piter->flags = flags; |
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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) { |
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struct disk_part_tbl *ptbl; |
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int inc, end; /* put the last partition */ disk_put_part(piter->part); piter->part = NULL; |
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/* get part_tbl */ |
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rcu_read_lock(); |
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ptbl = rcu_dereference(piter->disk->part_tbl); |
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/* determine iteration parameters */ if (piter->flags & DISK_PITER_REVERSE) { inc = -1; |
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if (piter->flags & (DISK_PITER_INCL_PART0 | DISK_PITER_INCL_EMPTY_PART0)) |
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end = -1; else end = 0; |
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} else { inc = 1; |
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end = ptbl->len; |
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} /* iterate to the next partition */ for (; piter->idx != end; piter->idx += inc) { struct hd_struct *part; |
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part = rcu_dereference(ptbl->part[piter->idx]); |
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if (!part) continue; |
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if (!part->nr_sects && !(piter->flags & DISK_PITER_INCL_EMPTY) && !(piter->flags & DISK_PITER_INCL_EMPTY_PART0 && piter->idx == 0)) |
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continue; |
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get_device(part_to_dev(part)); |
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piter->part = part; piter->idx += inc; break; } rcu_read_unlock(); return piter->part; } EXPORT_SYMBOL_GPL(disk_part_iter_next); /** * disk_part_iter_exit - finish up partition iteration * @piter: iter of interest * * Called when iteration is over. Cleans up @piter. * * CONTEXT: * Don't care. */ void disk_part_iter_exit(struct disk_part_iter *piter) { disk_put_part(piter->part); piter->part = NULL; } EXPORT_SYMBOL_GPL(disk_part_iter_exit); |
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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; } |
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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: |
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* Found partition on success, part0 is returned if no partition matches |
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*/ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) { |
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struct disk_part_tbl *ptbl; |
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struct hd_struct *part; |
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int i; |
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ptbl = rcu_dereference(disk->part_tbl); |
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part = rcu_dereference(ptbl->last_lookup); if (part && sector_in_part(part, sector)) return part; |
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for (i = 1; i < ptbl->len; i++) { |
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part = rcu_dereference(ptbl->part[i]); |
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if (part && sector_in_part(part, sector)) { rcu_assign_pointer(ptbl->last_lookup, part); |
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return part; |
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} |
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} |
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return &disk->part0; |
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} EXPORT_SYMBOL_GPL(disk_map_sector_rcu); |
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/* * Can be deleted altogether. Later. * */ static struct blk_major_name { struct blk_major_name *next; int major; char name[16]; |
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} *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
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/* index in the above - for now: assume no multimajor ranges */ |
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static inline int major_to_index(unsigned major) |
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{ |
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return major % BLKDEV_MAJOR_HASH_SIZE; |
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} |
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#ifdef CONFIG_PROC_FS |
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void blkdev_show(struct seq_file *seqf, off_t offset) |
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{ |
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struct blk_major_name *dp; |
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if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
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mutex_lock(&block_class_lock); |
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for (dp = major_names[offset]; dp; dp = dp->next) |
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seq_printf(seqf, "%3d %s ", dp->major, dp->name); |
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mutex_unlock(&block_class_lock); |
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} |
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} |
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#endif /* CONFIG_PROC_FS */ |
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/** * 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 */ |
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int register_blkdev(unsigned int major, const char *name) { struct blk_major_name **n, *p; int index, ret = 0; |
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mutex_lock(&block_class_lock); |
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/* 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 ", 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 ", major, name); kfree(p); } out: |
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mutex_unlock(&block_class_lock); |
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return ret; } EXPORT_SYMBOL(register_blkdev); |
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void unregister_blkdev(unsigned int major, const char *name) |
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{ struct blk_major_name **n; struct blk_major_name *p = NULL; int index = major_to_index(major); |
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mutex_lock(&block_class_lock); |
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for (n = &major_names[index]; *n; n = &(*n)->next) if ((*n)->major == major) break; |
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if (!*n || strcmp((*n)->name, name)) { WARN_ON(1); |
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} else { |
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p = *n; *n = p->next; } |
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mutex_unlock(&block_class_lock); |
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kfree(p); |
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} EXPORT_SYMBOL(unregister_blkdev); static struct kobj_map *bdev_map; |
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/** |
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* 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 |
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* @devt: out parameter for resulting dev_t * * Allocate a dev_t for block device. * * RETURNS: * 0 on success, allocated dev_t is returned in *@devt. -errno on * failure. * * CONTEXT: * Might sleep. */ int blk_alloc_devt(struct hd_struct *part, dev_t *devt) { struct gendisk *disk = part_to_disk(part); int idx, rc; /* in consecutive minor range? */ if (part->partno < disk->minors) { *devt = MKDEV(disk->major, disk->first_minor + part->partno); return 0; } /* allocate ext devt */ do { if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) return -ENOMEM; rc = idr_get_new(&ext_devt_idr, part, &idx); } while (rc == -EAGAIN); if (rc) return rc; if (idx > MAX_EXT_DEVT) { idr_remove(&ext_devt_idr, idx); return -EBUSY; } |
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*devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
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return 0; } /** * blk_free_devt - free a dev_t * @devt: dev_t to free * * Free @devt which was allocated using blk_alloc_devt(). * * CONTEXT: * Might sleep. */ void blk_free_devt(dev_t devt) { might_sleep(); if (devt == MKDEV(0, 0)) return; if (MAJOR(devt) == BLOCK_EXT_MAJOR) { mutex_lock(&ext_devt_mutex); |
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idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
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mutex_unlock(&ext_devt_mutex); } } |
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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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/* * Register device numbers dev..(dev+range-1) * range must be nonzero * The hash chain is sorted on range, so that subranges can override. */ |
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void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
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struct kobject *(*probe)(dev_t, int *, void *), int (*lock)(dev_t, void *), void *data) { |
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kobj_map(bdev_map, devt, range, module, probe, lock, data); |
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} EXPORT_SYMBOL(blk_register_region); |
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void blk_unregister_region(dev_t devt, unsigned long range) |
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{ |
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kobj_unmap(bdev_map, devt, range); |
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} EXPORT_SYMBOL(blk_unregister_region); |
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static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
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{ struct gendisk *p = data; |
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return &disk_to_dev(p)->kobj; |
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} |
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static int exact_lock(dev_t devt, void *data) |
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{ struct gendisk *p = data; if (!get_disk(p)) return -1; return 0; } |
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static void register_disk(struct gendisk *disk) |
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{ 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, 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; } } 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 */ |
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if (!disk_part_scan_enabled(disk)) |
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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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/** * add_disk - add partitioning information to kernel list * @disk: per-device partitioning information * * This function registers the partitioning information in @disk * with the kernel. |
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* * FIXME: error handling |
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*/ void add_disk(struct gendisk *disk) { |
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struct backing_dev_info *bdi; |
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dev_t devt; |
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int retval; |
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/* 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)); |
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disk->flags |= GENHD_FL_UP; |
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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); |
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disk_alloc_events(disk); |
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/* Register BDI before referencing it from bdev */ |
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bdi = &disk->queue->backing_dev_info; bdi_register_dev(bdi, disk_devt(disk)); |
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blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk); |
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register_disk(disk); blk_register_queue(disk); |
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/* * Take an extra ref on queue which will be put on disk_release() * so that it sticks around as long as @disk is there. */ |
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WARN_ON_ONCE(!blk_get_queue(disk->queue)); |
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retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, "bdi"); |
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WARN_ON(retval); |
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disk_add_events(disk); |
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} |
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EXPORT_SYMBOL(add_disk); |
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void del_gendisk(struct gendisk *disk) |
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{ |
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struct disk_part_iter piter; struct hd_struct *part; |
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disk_del_events(disk); |
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|
606 607 608 609 610 611 612 613 614 615 616 617 618 |
/* 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); blk_free_devt(disk_to_dev(disk)->devt); set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; |
ed9e19823
|
619 |
sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
cf0ca9fe5
|
620 |
bdi_unregister(&disk->queue->backing_dev_info); |
1da177e4c
|
621 |
blk_unregister_queue(disk); |
f331c0296
|
622 |
blk_unregister_region(disk_devt(disk), disk->minors); |
d2bf1b672
|
623 624 625 626 627 628 629 630 631 632 |
part_stat_set_all(&disk->part0, 0); disk->part0.stamp = 0; kobject_put(disk->part0.holder_dir); kobject_put(disk->slave_dir); disk->driverfs_dev = NULL; if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); device_del(disk_to_dev(disk)); |
1da177e4c
|
633 |
} |
d2bf1b672
|
634 |
EXPORT_SYMBOL(del_gendisk); |
1da177e4c
|
635 |
|
1da177e4c
|
636 637 |
/** * get_gendisk - get partitioning information for a given device |
710027a48
|
638 |
* @devt: device to get partitioning information for |
496aa8a98
|
639 |
* @partno: returned partition index |
1da177e4c
|
640 641 |
* * This function gets the structure containing partitioning |
710027a48
|
642 |
* information for the given device @devt. |
1da177e4c
|
643 |
*/ |
cf771cb5a
|
644 |
struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4c
|
645 |
{ |
bcce3de1b
|
646 647 648 649 650 651 652 653 654 655 656 657 |
struct gendisk *disk = NULL; if (MAJOR(devt) != BLOCK_EXT_MAJOR) { struct kobject *kobj; kobj = kobj_lookup(bdev_map, devt, partno); if (kobj) disk = dev_to_disk(kobj_to_dev(kobj)); } else { struct hd_struct *part; mutex_lock(&ext_devt_mutex); |
870d66561
|
658 |
part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1b
|
659 660 661 662 663 664 |
if (part && get_disk(part_to_disk(part))) { *partno = part->partno; disk = part_to_disk(part); } mutex_unlock(&ext_devt_mutex); } |
edfaa7c36
|
665 |
|
bcce3de1b
|
666 |
return disk; |
1da177e4c
|
667 |
} |
b6ac23af2
|
668 |
EXPORT_SYMBOL(get_gendisk); |
1da177e4c
|
669 |
|
f331c0296
|
670 671 672 673 674 675 676 677 678 679 680 681 682 |
/** * 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. */ |
aeb3d3a81
|
683 |
struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c0296
|
684 |
{ |
548b10eb2
|
685 686 |
struct hd_struct *part; struct block_device *bdev = NULL; |
f331c0296
|
687 |
|
548b10eb2
|
688 |
part = disk_get_part(disk, partno); |
2bbedcb4c
|
689 |
if (part) |
548b10eb2
|
690 691 |
bdev = bdget(part_devt(part)); disk_put_part(part); |
f331c0296
|
692 |
|
548b10eb2
|
693 |
return bdev; |
f331c0296
|
694 695 |
} EXPORT_SYMBOL(bdget_disk); |
dd2a345f8
|
696 |
/* |
5c6f35c5e
|
697 698 699 700 701 702 |
* 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) { |
def4e38dd
|
703 704 705 706 707 708 |
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); |
e71bf0d0e
|
709 710 |
struct disk_part_iter piter; struct hd_struct *part; |
1f0142905
|
711 712 |
char name_buf[BDEVNAME_SIZE]; char devt_buf[BDEVT_SIZE]; |
b5af921ec
|
713 |
u8 uuid[PARTITION_META_INFO_UUIDLTH * 2 + 1]; |
def4e38dd
|
714 715 716 |
/* * Don't show empty devices or things that have been |
25985edce
|
717 |
* suppressed |
def4e38dd
|
718 719 720 721 722 723 724 725 726 727 |
*/ 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. */ |
074a7aca7
|
728 729 730 |
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) { bool is_part0 = part == &disk->part0; |
def4e38dd
|
731 |
|
b5af921ec
|
732 733 734 735 736 |
uuid[0] = 0; if (part->info) part_unpack_uuid(part->info->uuid, uuid); printk("%s%s %10llu %s %s", is_part0 ? "" : " ", |
1f0142905
|
737 |
bdevt_str(part_devt(part), devt_buf), |
f331c0296
|
738 |
(unsigned long long)part->nr_sects >> 1, |
b5af921ec
|
739 |
disk_name(disk, part->partno, name_buf), uuid); |
074a7aca7
|
740 741 742 743 744 745 746 747 748 749 750 751 752 |
if (is_part0) { if (disk->driverfs_dev != NULL && disk->driverfs_dev->driver != NULL) printk(" driver: %s ", disk->driverfs_dev->driver->name); else printk(" (driver?) "); } else printk(" "); } |
e71bf0d0e
|
753 |
disk_part_iter_exit(&piter); |
def4e38dd
|
754 755 |
} class_dev_iter_exit(&iter); |
dd2a345f8
|
756 |
} |
1da177e4c
|
757 758 |
#ifdef CONFIG_PROC_FS /* iterator */ |
def4e38dd
|
759 |
static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a78
|
760 |
{ |
def4e38dd
|
761 762 763 |
loff_t skip = *pos; struct class_dev_iter *iter; struct device *dev; |
68c4d4a78
|
764 |
|
aeb3d3a81
|
765 |
iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38dd
|
766 767 768 769 770 771 772 773 774 775 776 777 |
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); |
68c4d4a78
|
778 |
} |
def4e38dd
|
779 |
static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4c
|
780 |
{ |
edfaa7c36
|
781 |
struct device *dev; |
1da177e4c
|
782 |
|
def4e38dd
|
783 784 |
(*pos)++; dev = class_dev_iter_next(seqf->private); |
2ac3cee52
|
785 |
if (dev) |
68c4d4a78
|
786 |
return dev_to_disk(dev); |
2ac3cee52
|
787 |
|
1da177e4c
|
788 789 |
return NULL; } |
def4e38dd
|
790 |
static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f302519
|
791 |
{ |
def4e38dd
|
792 |
struct class_dev_iter *iter = seqf->private; |
27f302519
|
793 |
|
def4e38dd
|
794 795 796 797 |
/* stop is called even after start failed :-( */ if (iter) { class_dev_iter_exit(iter); kfree(iter); |
5c0ef6d02
|
798 |
} |
1da177e4c
|
799 |
} |
def4e38dd
|
800 |
static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4c
|
801 |
{ |
def4e38dd
|
802 803 804 |
static void *p; p = disk_seqf_start(seqf, pos); |
b9f985b6e
|
805 |
if (!IS_ERR_OR_NULL(p) && !*pos) |
def4e38dd
|
806 807 808 809 |
seq_puts(seqf, "major minor #blocks name "); return p; |
1da177e4c
|
810 |
} |
cf771cb5a
|
811 |
static int show_partition(struct seq_file *seqf, void *v) |
1da177e4c
|
812 813 |
{ struct gendisk *sgp = v; |
e71bf0d0e
|
814 815 |
struct disk_part_iter piter; struct hd_struct *part; |
1da177e4c
|
816 |
char buf[BDEVNAME_SIZE]; |
1da177e4c
|
817 |
/* Don't show non-partitionable removeable devices or empty devices */ |
d27769ec3
|
818 |
if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
f331c0296
|
819 |
(sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4c
|
820 821 822 823 824 |
return 0; if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) return 0; /* show the full disk and all non-0 size partitions of it */ |
074a7aca7
|
825 |
disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0e
|
826 |
while ((part = disk_part_iter_next(&piter))) |
1f0142905
|
827 828 |
seq_printf(seqf, "%4d %7d %10llu %s ", |
f331c0296
|
829 830 831 |
MAJOR(part_devt(part)), MINOR(part_devt(part)), (unsigned long long)part->nr_sects >> 1, disk_name(sgp, part->partno, buf)); |
e71bf0d0e
|
832 |
disk_part_iter_exit(&piter); |
1da177e4c
|
833 834 835 |
return 0; } |
f500975a3
|
836 |
static const struct seq_operations partitions_op = { |
def4e38dd
|
837 838 839 |
.start = show_partition_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
edfaa7c36
|
840 |
.show = show_partition |
1da177e4c
|
841 |
}; |
f500975a3
|
842 843 844 845 846 847 848 849 850 851 852 853 |
static int partitions_open(struct inode *inode, struct file *file) { return seq_open(file, &partitions_op); } static const struct file_operations proc_partitions_operations = { .open = partitions_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
1da177e4c
|
854 |
#endif |
cf771cb5a
|
855 |
static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4c
|
856 |
{ |
edfaa7c36
|
857 |
if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4c
|
858 |
/* Make old-style 2.4 aliases work */ |
edfaa7c36
|
859 |
request_module("block-major-%d", MAJOR(devt)); |
1da177e4c
|
860 861 862 863 864 |
return NULL; } static int __init genhd_device_init(void) { |
e105b8bfc
|
865 866 867 868 |
int error; block_class.dev_kobj = sysfs_dev_block_kobj; error = class_register(&block_class); |
ee27a558a
|
869 870 |
if (unlikely(error)) return error; |
edfaa7c36
|
871 |
bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4c
|
872 |
blk_dev_init(); |
edfaa7c36
|
873 |
|
561ec68e4
|
874 |
register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
edfaa7c36
|
875 |
/* create top-level block dir */ |
e52eec13c
|
876 877 |
if (!sysfs_deprecated) block_depr = kobject_create_and_add("block", NULL); |
830d3cfb1
|
878 |
return 0; |
1da177e4c
|
879 880 881 |
} subsys_initcall(genhd_device_init); |
edfaa7c36
|
882 883 |
static ssize_t disk_range_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4c
|
884 |
{ |
edfaa7c36
|
885 |
struct gendisk *disk = dev_to_disk(dev); |
1da177e4c
|
886 |
|
edfaa7c36
|
887 888 |
return sprintf(buf, "%d ", disk->minors); |
1da177e4c
|
889 |
} |
1f0142905
|
890 891 892 893 |
static ssize_t disk_ext_range_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
b5d0b9df0
|
894 895 |
return sprintf(buf, "%d ", disk_max_parts(disk)); |
1f0142905
|
896 |
} |
edfaa7c36
|
897 898 |
static ssize_t disk_removable_show(struct device *dev, struct device_attribute *attr, char *buf) |
a7fd67062
|
899 |
{ |
edfaa7c36
|
900 |
struct gendisk *disk = dev_to_disk(dev); |
a7fd67062
|
901 |
|
edfaa7c36
|
902 903 904 |
return sprintf(buf, "%d ", (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); |
a7fd67062
|
905 |
} |
1c9ce5276
|
906 907 908 909 |
static ssize_t disk_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
b7db9956e
|
910 911 |
return sprintf(buf, "%d ", get_disk_ro(disk) ? 1 : 0); |
1c9ce5276
|
912 |
} |
edfaa7c36
|
913 914 |
static ssize_t disk_capability_show(struct device *dev, struct device_attribute *attr, char *buf) |
86ce18d7b
|
915 |
{ |
edfaa7c36
|
916 917 918 919 |
struct gendisk *disk = dev_to_disk(dev); return sprintf(buf, "%x ", disk->flags); |
86ce18d7b
|
920 |
} |
edfaa7c36
|
921 |
|
c72758f33
|
922 923 924 925 926 927 928 929 930 |
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 ", queue_alignment_offset(disk->queue)); } |
86b372814
|
931 932 933 934 935 |
static ssize_t disk_discard_alignment_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
dd3d145d4
|
936 937 |
return sprintf(buf, "%d ", queue_discard_alignment(disk->queue)); |
86b372814
|
938 |
} |
edfaa7c36
|
939 |
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f0142905
|
940 |
static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c36
|
941 |
static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce5276
|
942 |
static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
e56105214
|
943 |
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
c72758f33
|
944 |
static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL); |
86b372814
|
945 946 |
static DEVICE_ATTR(discard_alignment, S_IRUGO, disk_discard_alignment_show, NULL); |
edfaa7c36
|
947 |
static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); |
074a7aca7
|
948 |
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315bf
|
949 |
static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
c17bb4951
|
950 |
#ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c36
|
951 |
static struct device_attribute dev_attr_fail = |
eddb2e26b
|
952 |
__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
c17bb4951
|
953 |
#endif |
581d4e28d
|
954 955 956 957 958 |
#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 |
edfaa7c36
|
959 960 961 |
static struct attribute *disk_attrs[] = { &dev_attr_range.attr, |
1f0142905
|
962 |
&dev_attr_ext_range.attr, |
edfaa7c36
|
963 |
&dev_attr_removable.attr, |
1c9ce5276
|
964 |
&dev_attr_ro.attr, |
edfaa7c36
|
965 |
&dev_attr_size.attr, |
c72758f33
|
966 |
&dev_attr_alignment_offset.attr, |
86b372814
|
967 |
&dev_attr_discard_alignment.attr, |
edfaa7c36
|
968 969 |
&dev_attr_capability.attr, &dev_attr_stat.attr, |
316d315bf
|
970 |
&dev_attr_inflight.attr, |
edfaa7c36
|
971 972 973 |
#ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif |
581d4e28d
|
974 975 976 |
#ifdef CONFIG_FAIL_IO_TIMEOUT &dev_attr_fail_timeout.attr, #endif |
edfaa7c36
|
977 978 979 980 981 982 |
NULL }; static struct attribute_group disk_attr_group = { .attrs = disk_attrs, }; |
a4dbd6740
|
983 |
static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c36
|
984 985 |
&disk_attr_group, NULL |
1da177e4c
|
986 |
}; |
540eed563
|
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 |
/** * 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); |
a6f23657d
|
1004 1005 1006 |
if (old_ptbl) { rcu_assign_pointer(old_ptbl->last_lookup, NULL); |
57bdfbf9e
|
1007 |
kfree_rcu(old_ptbl, rcu_head); |
a6f23657d
|
1008 |
} |
540eed563
|
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 |
} /** * disk_expand_part_tbl - expand disk->part_tbl * @disk: disk to expand part_tbl for * @partno: expand such that this partno can fit in * * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl * uses RCU to allow unlocked dereferencing for stats and other stuff. * * LOCKING: * Matching bd_mutex locked, might sleep. * * RETURNS: * 0 on success, -errno on failure. */ int disk_expand_part_tbl(struct gendisk *disk, int partno) { struct disk_part_tbl *old_ptbl = disk->part_tbl; struct disk_part_tbl *new_ptbl; int len = old_ptbl ? old_ptbl->len : 0; int target = partno + 1; size_t size; int i; /* disk_max_parts() is zero during initialization, ignore if so */ if (disk_max_parts(disk) && target > disk_max_parts(disk)) return -EINVAL; if (target <= len) return 0; size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]); new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id); if (!new_ptbl) return -ENOMEM; |
540eed563
|
1045 1046 1047 1048 1049 1050 1051 1052 |
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; } |
edfaa7c36
|
1053 |
static void disk_release(struct device *dev) |
1da177e4c
|
1054 |
{ |
edfaa7c36
|
1055 |
struct gendisk *disk = dev_to_disk(dev); |
77ea887e4
|
1056 |
disk_release_events(disk); |
1da177e4c
|
1057 |
kfree(disk->random); |
540eed563
|
1058 |
disk_replace_part_tbl(disk, NULL); |
074a7aca7
|
1059 |
free_part_stats(&disk->part0); |
6d1d8050b
|
1060 |
free_part_info(&disk->part0); |
523e1d399
|
1061 1062 |
if (disk->queue) blk_put_queue(disk->queue); |
1da177e4c
|
1063 1064 |
kfree(disk); } |
edfaa7c36
|
1065 1066 |
struct class block_class = { .name = "block", |
1da177e4c
|
1067 |
}; |
2c9ede55e
|
1068 |
static char *block_devnode(struct device *dev, umode_t *mode) |
b03f38b68
|
1069 1070 |
{ struct gendisk *disk = dev_to_disk(dev); |
e454cea20
|
1071 1072 |
if (disk->devnode) return disk->devnode(disk, mode); |
b03f38b68
|
1073 1074 |
return NULL; } |
1826eadfc
|
1075 |
static struct device_type disk_type = { |
edfaa7c36
|
1076 1077 1078 |
.name = "disk", .groups = disk_attr_groups, .release = disk_release, |
e454cea20
|
1079 |
.devnode = block_devnode, |
1da177e4c
|
1080 |
}; |
a6e2ba887
|
1081 |
#ifdef CONFIG_PROC_FS |
cf771cb5a
|
1082 1083 1084 1085 1086 1087 1088 1089 |
/* * 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) |
1da177e4c
|
1090 1091 |
{ struct gendisk *gp = v; |
e71bf0d0e
|
1092 1093 |
struct disk_part_iter piter; struct hd_struct *hd; |
1da177e4c
|
1094 |
char buf[BDEVNAME_SIZE]; |
c99590591
|
1095 |
int cpu; |
1da177e4c
|
1096 1097 |
/* |
ed9e19823
|
1098 |
if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5a
|
1099 |
seq_puts(seqf, "major minor name" |
1da177e4c
|
1100 1101 1102 1103 1104 1105 |
" rio rmerge rsect ruse wio wmerge " "wsect wuse running use aveq" " "); */ |
9f5e48655
|
1106 |
|
71982a409
|
1107 |
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
e71bf0d0e
|
1108 |
while ((hd = disk_part_iter_next(&piter))) { |
074a7aca7
|
1109 |
cpu = part_stat_lock(); |
c99590591
|
1110 |
part_round_stats(cpu, hd); |
074a7aca7
|
1111 |
part_stat_unlock(); |
f95fe9cfb
|
1112 1113 1114 |
seq_printf(seqf, "%4d %7d %s %lu %lu %lu " "%u %lu %lu %lu %u %u %u %u ", |
f331c0296
|
1115 1116 |
MAJOR(part_devt(hd)), MINOR(part_devt(hd)), disk_name(gp, hd->partno, buf), |
53f22956e
|
1117 1118 |
part_stat_read(hd, ios[READ]), part_stat_read(hd, merges[READ]), |
f95fe9cfb
|
1119 |
part_stat_read(hd, sectors[READ]), |
53f22956e
|
1120 1121 1122 |
jiffies_to_msecs(part_stat_read(hd, ticks[READ])), part_stat_read(hd, ios[WRITE]), part_stat_read(hd, merges[WRITE]), |
f95fe9cfb
|
1123 |
part_stat_read(hd, sectors[WRITE]), |
53f22956e
|
1124 |
jiffies_to_msecs(part_stat_read(hd, ticks[WRITE])), |
316d315bf
|
1125 |
part_in_flight(hd), |
28f39d553
|
1126 1127 1128 |
jiffies_to_msecs(part_stat_read(hd, io_ticks)), jiffies_to_msecs(part_stat_read(hd, time_in_queue)) ); |
1da177e4c
|
1129 |
} |
e71bf0d0e
|
1130 |
disk_part_iter_exit(&piter); |
9f5e48655
|
1131 |
|
1da177e4c
|
1132 1133 |
return 0; } |
31d85ab28
|
1134 |
static const struct seq_operations diskstats_op = { |
def4e38dd
|
1135 1136 1137 |
.start = disk_seqf_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
1da177e4c
|
1138 1139 |
.show = diskstats_show }; |
f500975a3
|
1140 |
|
31d85ab28
|
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 |
static int diskstats_open(struct inode *inode, struct file *file) { return seq_open(file, &diskstats_op); } static const struct file_operations proc_diskstats_operations = { .open = diskstats_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; |
f500975a3
|
1152 1153 |
static int __init proc_genhd_init(void) { |
31d85ab28
|
1154 |
proc_create("diskstats", 0, NULL, &proc_diskstats_operations); |
f500975a3
|
1155 1156 1157 1158 |
proc_create("partitions", 0, NULL, &proc_partitions_operations); return 0; } module_init(proc_genhd_init); |
a6e2ba887
|
1159 |
#endif /* CONFIG_PROC_FS */ |
1da177e4c
|
1160 |
|
cf771cb5a
|
1161 |
dev_t blk_lookup_devt(const char *name, int partno) |
a142be856
|
1162 |
{ |
def4e38dd
|
1163 1164 1165 |
dev_t devt = MKDEV(0, 0); struct class_dev_iter iter; struct device *dev; |
a142be856
|
1166 |
|
def4e38dd
|
1167 1168 |
class_dev_iter_init(&iter, &block_class, NULL, &disk_type); while ((dev = class_dev_iter_next(&iter))) { |
a142be856
|
1169 |
struct gendisk *disk = dev_to_disk(dev); |
548b10eb2
|
1170 |
struct hd_struct *part; |
a142be856
|
1171 |
|
3ada8b7e9
|
1172 |
if (strcmp(dev_name(dev), name)) |
f331c0296
|
1173 |
continue; |
f331c0296
|
1174 |
|
41b8c853a
|
1175 1176 1177 1178 1179 1180 1181 1182 |
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; } |
548b10eb2
|
1183 |
part = disk_get_part(disk, partno); |
2bbedcb4c
|
1184 |
if (part) { |
f331c0296
|
1185 |
devt = part_devt(part); |
e71bf0d0e
|
1186 |
disk_put_part(part); |
548b10eb2
|
1187 |
break; |
def4e38dd
|
1188 |
} |
548b10eb2
|
1189 |
disk_put_part(part); |
5c0ef6d02
|
1190 |
} |
def4e38dd
|
1191 |
class_dev_iter_exit(&iter); |
edfaa7c36
|
1192 1193 |
return devt; } |
edfaa7c36
|
1194 |
EXPORT_SYMBOL(blk_lookup_devt); |
1da177e4c
|
1195 1196 |
struct gendisk *alloc_disk(int minors) { |
1946089a1
|
1197 1198 |
return alloc_disk_node(minors, -1); } |
689d6fac4
|
1199 |
EXPORT_SYMBOL(alloc_disk); |
1946089a1
|
1200 1201 1202 1203 |
struct gendisk *alloc_disk_node(int minors, int node_id) { struct gendisk *disk; |
94f6030ca
|
1204 1205 |
disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL | __GFP_ZERO, node_id); |
1da177e4c
|
1206 |
if (disk) { |
074a7aca7
|
1207 |
if (!init_part_stats(&disk->part0)) { |
1da177e4c
|
1208 1209 1210 |
kfree(disk); return NULL; } |
bf91db18a
|
1211 |
disk->node_id = node_id; |
540eed563
|
1212 1213 |
if (disk_expand_part_tbl(disk, 0)) { free_part_stats(&disk->part0); |
b5d0b9df0
|
1214 1215 |
kfree(disk); return NULL; |
1da177e4c
|
1216 |
} |
540eed563
|
1217 |
disk->part_tbl->part[0] = &disk->part0; |
6c23a9681
|
1218 1219 |
hd_ref_init(&disk->part0); |
b5d0b9df0
|
1220 |
|
1da177e4c
|
1221 |
disk->minors = minors; |
1da177e4c
|
1222 |
rand_initialize_disk(disk); |
ed9e19823
|
1223 1224 1225 |
disk_to_dev(disk)->class = &block_class; disk_to_dev(disk)->type = &disk_type; device_initialize(disk_to_dev(disk)); |
1da177e4c
|
1226 1227 1228 |
} return disk; } |
1946089a1
|
1229 |
EXPORT_SYMBOL(alloc_disk_node); |
1da177e4c
|
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 |
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; |
ed9e19823
|
1241 |
kobj = kobject_get(&disk_to_dev(disk)->kobj); |
1da177e4c
|
1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 |
if (kobj == NULL) { module_put(owner); return NULL; } return kobj; } EXPORT_SYMBOL(get_disk); void put_disk(struct gendisk *disk) { if (disk) |
ed9e19823
|
1255 |
kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4c
|
1256 1257 1258 |
} EXPORT_SYMBOL(put_disk); |
e3264a4d7
|
1259 1260 1261 1262 1263 1264 1265 1266 1267 |
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); } |
1da177e4c
|
1268 1269 |
void set_device_ro(struct block_device *bdev, int flag) { |
b7db9956e
|
1270 |
bdev->bd_part->policy = flag; |
1da177e4c
|
1271 1272 1273 1274 1275 1276 |
} EXPORT_SYMBOL(set_device_ro); void set_disk_ro(struct gendisk *disk, int flag) { |
e71bf0d0e
|
1277 1278 |
struct disk_part_iter piter; struct hd_struct *part; |
e3264a4d7
|
1279 1280 1281 1282 1283 1284 |
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); |
e71bf0d0e
|
1285 1286 1287 |
while ((part = disk_part_iter_next(&piter))) part->policy = flag; disk_part_iter_exit(&piter); |
1da177e4c
|
1288 1289 1290 1291 1292 1293 1294 1295 |
} EXPORT_SYMBOL(set_disk_ro); int bdev_read_only(struct block_device *bdev) { if (!bdev) return 0; |
b7db9956e
|
1296 |
return bdev->bd_part->policy; |
1da177e4c
|
1297 1298 1299 |
} EXPORT_SYMBOL(bdev_read_only); |
cf771cb5a
|
1300 |
int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4c
|
1301 1302 |
{ int res = 0; |
cf771cb5a
|
1303 |
struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4c
|
1304 |
if (bdev) { |
2ef41634d
|
1305 |
fsync_bdev(bdev); |
93b270f76
|
1306 |
res = __invalidate_device(bdev, true); |
1da177e4c
|
1307 1308 1309 1310 1311 1312 |
bdput(bdev); } return res; } EXPORT_SYMBOL(invalidate_partition); |
77ea887e4
|
1313 1314 1315 1316 1317 1318 1319 1320 |
/* * 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; |
fdd514e16
|
1321 |
struct mutex block_mutex; /* protects blocking */ |
77ea887e4
|
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 |
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 = 0; 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); } |
c3af54afb
|
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 |
/** * 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) |
77ea887e4
|
1380 1381 1382 1383 |
{ struct disk_events *ev = disk->ev; unsigned long flags; bool cancel; |
c3af54afb
|
1384 1385 |
if (!ev) return; |
fdd514e16
|
1386 1387 1388 1389 1390 |
/* * Outer mutex ensures that the first blocker completes canceling * the event work before further blockers are allowed to finish. */ mutex_lock(&ev->block_mutex); |
77ea887e4
|
1391 1392 1393 |
spin_lock_irqsave(&ev->lock, flags); cancel = !ev->block++; spin_unlock_irqrestore(&ev->lock, flags); |
c3af54afb
|
1394 1395 |
if (cancel) cancel_delayed_work_sync(&disk->ev->dwork); |
fdd514e16
|
1396 1397 |
mutex_unlock(&ev->block_mutex); |
77ea887e4
|
1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 |
} 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) |
62d3c5439
|
1421 |
queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, 0); |
77ea887e4
|
1422 |
else if (intv) |
62d3c5439
|
1423 |
queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, intv); |
77ea887e4
|
1424 1425 1426 1427 1428 |
out_unlock: spin_unlock_irqrestore(&ev->lock, flags); } /** |
77ea887e4
|
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
* 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) |
facc31ddc
|
1441 |
__disk_unblock_events(disk, false); |
77ea887e4
|
1442 1443 1444 |
} /** |
85ef06d1d
|
1445 1446 1447 |
* disk_flush_events - schedule immediate event checking and flushing * @disk: disk to check and flush events for * @mask: events to flush |
77ea887e4
|
1448 |
* |
85ef06d1d
|
1449 1450 1451 |
* 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. |
77ea887e4
|
1452 1453 |
* * CONTEXT: |
85ef06d1d
|
1454 |
* If @mask is non-zero must be called with bdev->bd_mutex held. |
77ea887e4
|
1455 |
*/ |
85ef06d1d
|
1456 |
void disk_flush_events(struct gendisk *disk, unsigned int mask) |
77ea887e4
|
1457 |
{ |
a9dce2a3b
|
1458 |
struct disk_events *ev = disk->ev; |
a9dce2a3b
|
1459 1460 1461 |
if (!ev) return; |
85ef06d1d
|
1462 1463 |
spin_lock_irq(&ev->lock); ev->clearing |= mask; |
a9dce2a3b
|
1464 1465 |
if (!ev->block) { cancel_delayed_work(&ev->dwork); |
62d3c5439
|
1466 |
queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, 0); |
77ea887e4
|
1467 |
} |
85ef06d1d
|
1468 |
spin_unlock_irq(&ev->lock); |
77ea887e4
|
1469 |
} |
77ea887e4
|
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 |
/** * 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 clearted * * 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; 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; } /* tell the workfn about the events being cleared */ spin_lock_irq(&ev->lock); ev->clearing |= mask; spin_unlock_irq(&ev->lock); /* uncondtionally schedule event check and wait for it to finish */ |
c3af54afb
|
1502 |
disk_block_events(disk); |
62d3c5439
|
1503 |
queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, 0); |
77ea887e4
|
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 |
flush_delayed_work(&ev->dwork); __disk_unblock_events(disk, false); /* then, fetch and clear pending events */ spin_lock_irq(&ev->lock); WARN_ON_ONCE(ev->clearing & mask); /* cleared by workfn */ pending = ev->pending & mask; ev->pending &= ~mask; spin_unlock_irq(&ev->lock); return pending; } 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); struct gendisk *disk = ev->disk; char *envp[ARRAY_SIZE(disk_uevents) + 1] = { }; unsigned int clearing = ev->clearing; 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; ev->clearing &= ~clearing; intv = disk_events_poll_jiffies(disk); if (!ev->block && intv) |
62d3c5439
|
1540 |
queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, intv); |
77ea887e4
|
1541 1542 |
spin_unlock_irq(&ev->lock); |
7c88a168d
|
1543 1544 1545 1546 1547 |
/* * 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. */ |
77ea887e4
|
1548 |
for (i = 0; i < ARRAY_SIZE(disk_uevents); i++) |
7c88a168d
|
1549 |
if (events & disk->events & (1 << i)) |
77ea887e4
|
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 |
envp[nr_events++] = disk_uevents[i]; if (nr_events) kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); } /* * 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, " "); return pos; } 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); } 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); } 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 ", disk->ev->poll_msecs); } 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; |
c3af54afb
|
1620 |
disk_block_events(disk); |
77ea887e4
|
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 |
disk->ev->poll_msecs = intv; __disk_unblock_events(disk, true); return count; } 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) |
85ef06d1d
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1659 |
disk_flush_events(ev->disk, 0); |
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1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 |
mutex_unlock(&disk_events_mutex); return 0; } 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); /* |
9f53d2fe8
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1678 |
* disk_{alloc|add|del|release}_events - initialize and destroy disk_events. |
77ea887e4
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1679 |
*/ |
9f53d2fe8
|
1680 |
static void disk_alloc_events(struct gendisk *disk) |
77ea887e4
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1681 1682 |
{ struct disk_events *ev; |
75e3f3ee3
|
1683 |
if (!disk->fops->check_events) |
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1684 1685 1686 1687 1688 1689 1690 1691 |
return; ev = kzalloc(sizeof(*ev), GFP_KERNEL); if (!ev) { pr_warn("%s: failed to initialize events ", disk->disk_name); return; } |
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|
1692 1693 1694 |
INIT_LIST_HEAD(&ev->node); ev->disk = disk; spin_lock_init(&ev->lock); |
fdd514e16
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1695 |
mutex_init(&ev->block_mutex); |
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1696 1697 1698 |
ev->block = 1; ev->poll_msecs = -1; INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); |
9f53d2fe8
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1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 |
disk->ev = ev; } 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 ", disk->disk_name); |
77ea887e4
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1712 |
mutex_lock(&disk_events_mutex); |
9f53d2fe8
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1713 |
list_add_tail(&disk->ev->node, &disk_events); |
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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); } static void disk_del_events(struct gendisk *disk) { if (!disk->ev) return; |
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1727 |
disk_block_events(disk); |
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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); } 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); } |