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block/genhd.c
42.4 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/buffer_head.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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|
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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_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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|
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if (unlikely(partno < 0)) |
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return NULL; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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void register_disk(struct gendisk *disk) { struct device *ddev = disk_to_dev(disk); struct block_device *bdev; struct disk_part_iter piter; struct hd_struct *part; int err; ddev->parent = disk->driverfs_dev; dev_set_name(ddev, 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 */ if (!disk_partitionable(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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/** * 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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|
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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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/* Register BDI before referencing it from bdev */ bdi = &disk->queue->backing_dev_info; bdi_register_dev(bdi, disk_devt(disk)); |
f331c0296 block: don't depe... |
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blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk); |
1da177e4c Linux-2.6.12-rc2 |
583 584 |
register_disk(disk); blk_register_queue(disk); |
cf0ca9fe5 mm: bdi: export B... |
585 |
|
ed9e19823 block: implement ... |
586 587 |
retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, "bdi"); |
6ffeea77f block: fix compil... |
588 |
WARN_ON(retval); |
1da177e4c Linux-2.6.12-rc2 |
589 |
|
77ea887e4 implement in-kern... |
590 |
disk_add_events(disk); |
1da177e4c Linux-2.6.12-rc2 |
591 |
} |
1da177e4c Linux-2.6.12-rc2 |
592 |
EXPORT_SYMBOL(add_disk); |
1da177e4c Linux-2.6.12-rc2 |
593 |
|
d2bf1b672 block: move regis... |
594 |
void del_gendisk(struct gendisk *disk) |
1da177e4c Linux-2.6.12-rc2 |
595 |
{ |
d2bf1b672 block: move regis... |
596 597 |
struct disk_part_iter piter; struct hd_struct *part; |
77ea887e4 implement in-kern... |
598 |
disk_del_events(disk); |
d2bf1b672 block: move regis... |
599 600 601 602 603 604 605 606 607 608 609 610 611 |
/* 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 block: implement ... |
612 |
sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
cf0ca9fe5 mm: bdi: export B... |
613 |
bdi_unregister(&disk->queue->backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
614 |
blk_unregister_queue(disk); |
f331c0296 block: don't depe... |
615 |
blk_unregister_region(disk_devt(disk), disk->minors); |
d2bf1b672 block: move regis... |
616 617 618 619 620 621 622 623 624 625 |
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 Linux-2.6.12-rc2 |
626 |
} |
d2bf1b672 block: move regis... |
627 |
EXPORT_SYMBOL(del_gendisk); |
1da177e4c Linux-2.6.12-rc2 |
628 |
|
1da177e4c Linux-2.6.12-rc2 |
629 630 |
/** * get_gendisk - get partitioning information for a given device |
710027a48 Add some block/ s... |
631 |
* @devt: device to get partitioning information for |
496aa8a98 block: fix curren... |
632 |
* @partno: returned partition index |
1da177e4c Linux-2.6.12-rc2 |
633 634 |
* * This function gets the structure containing partitioning |
710027a48 Add some block/ s... |
635 |
* information for the given device @devt. |
1da177e4c Linux-2.6.12-rc2 |
636 |
*/ |
cf771cb5a block: make varia... |
637 |
struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4c Linux-2.6.12-rc2 |
638 |
{ |
bcce3de1b block: implement ... |
639 640 641 642 643 644 645 646 647 648 649 650 |
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 block: implement ... |
651 |
part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1b block: implement ... |
652 653 654 655 656 657 |
if (part && get_disk(part_to_disk(part))) { *partno = part->partno; disk = part_to_disk(part); } mutex_unlock(&ext_devt_mutex); } |
edfaa7c36 Driver core: conv... |
658 |
|
bcce3de1b block: implement ... |
659 |
return disk; |
1da177e4c Linux-2.6.12-rc2 |
660 |
} |
b6ac23af2 blkio: fix for mo... |
661 |
EXPORT_SYMBOL(get_gendisk); |
1da177e4c Linux-2.6.12-rc2 |
662 |
|
f331c0296 block: don't depe... |
663 664 665 666 667 668 669 670 671 672 673 674 675 |
/** * 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 block: kmalloc ar... |
676 |
struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c0296 block: don't depe... |
677 |
{ |
548b10eb2 block: move __dev... |
678 679 |
struct hd_struct *part; struct block_device *bdev = NULL; |
f331c0296 block: don't depe... |
680 |
|
548b10eb2 block: move __dev... |
681 |
part = disk_get_part(disk, partno); |
2bbedcb4c block: don't test... |
682 |
if (part) |
548b10eb2 block: move __dev... |
683 684 |
bdev = bdget(part_devt(part)); disk_put_part(part); |
f331c0296 block: don't depe... |
685 |
|
548b10eb2 block: move __dev... |
686 |
return bdev; |
f331c0296 block: don't depe... |
687 688 |
} EXPORT_SYMBOL(bdget_disk); |
dd2a345f8 Display all possi... |
689 |
/* |
5c6f35c5e block: make print... |
690 691 692 693 694 695 |
* 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 block: use class_... |
696 697 698 699 700 701 |
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 block: fix disk->... |
702 703 |
struct disk_part_iter piter; struct hd_struct *part; |
1f0142905 block: adjust for... |
704 705 |
char name_buf[BDEVNAME_SIZE]; char devt_buf[BDEVT_SIZE]; |
b5af921ec init: add support... |
706 |
u8 uuid[PARTITION_META_INFO_UUIDLTH * 2 + 1]; |
def4e38dd block: use class_... |
707 708 709 |
/* * Don't show empty devices or things that have been |
25985edce Fix common misspe... |
710 |
* suppressed |
def4e38dd block: use class_... |
711 712 713 714 715 716 717 718 719 720 |
*/ 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 block: move stats... |
721 722 723 |
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) { bool is_part0 = part == &disk->part0; |
def4e38dd block: use class_... |
724 |
|
b5af921ec init: add support... |
725 726 727 728 729 |
uuid[0] = 0; if (part->info) part_unpack_uuid(part->info->uuid, uuid); printk("%s%s %10llu %s %s", is_part0 ? "" : " ", |
1f0142905 block: adjust for... |
730 |
bdevt_str(part_devt(part), devt_buf), |
f331c0296 block: don't depe... |
731 |
(unsigned long long)part->nr_sects >> 1, |
b5af921ec init: add support... |
732 |
disk_name(disk, part->partno, name_buf), uuid); |
074a7aca7 block: move stats... |
733 734 735 736 737 738 739 740 741 742 743 744 745 |
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 block: fix disk->... |
746 |
disk_part_iter_exit(&piter); |
def4e38dd block: use class_... |
747 748 |
} class_dev_iter_exit(&iter); |
dd2a345f8 Display all possi... |
749 |
} |
1da177e4c Linux-2.6.12-rc2 |
750 751 |
#ifdef CONFIG_PROC_FS /* iterator */ |
def4e38dd block: use class_... |
752 |
static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a78 block: make proc ... |
753 |
{ |
def4e38dd block: use class_... |
754 755 756 |
loff_t skip = *pos; struct class_dev_iter *iter; struct device *dev; |
68c4d4a78 block: make proc ... |
757 |
|
aeb3d3a81 block: kmalloc ar... |
758 |
iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38dd block: use class_... |
759 760 761 762 763 764 765 766 767 768 769 770 |
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 block: make proc ... |
771 |
} |
def4e38dd block: use class_... |
772 |
static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4c Linux-2.6.12-rc2 |
773 |
{ |
edfaa7c36 Driver core: conv... |
774 |
struct device *dev; |
1da177e4c Linux-2.6.12-rc2 |
775 |
|
def4e38dd block: use class_... |
776 777 |
(*pos)++; dev = class_dev_iter_next(seqf->private); |
2ac3cee52 block: don't grab... |
778 |
if (dev) |
68c4d4a78 block: make proc ... |
779 |
return dev_to_disk(dev); |
2ac3cee52 block: don't grab... |
780 |
|
1da177e4c Linux-2.6.12-rc2 |
781 782 |
return NULL; } |
def4e38dd block: use class_... |
783 |
static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f302519 block: make /proc... |
784 |
{ |
def4e38dd block: use class_... |
785 |
struct class_dev_iter *iter = seqf->private; |
27f302519 block: make /proc... |
786 |
|
def4e38dd block: use class_... |
787 788 789 790 |
/* stop is called even after start failed :-( */ if (iter) { class_dev_iter_exit(iter); kfree(iter); |
5c0ef6d02 block: drop refer... |
791 |
} |
1da177e4c Linux-2.6.12-rc2 |
792 |
} |
def4e38dd block: use class_... |
793 |
static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4c Linux-2.6.12-rc2 |
794 |
{ |
def4e38dd block: use class_... |
795 796 797 |
static void *p; p = disk_seqf_start(seqf, pos); |
b9f985b6e block: convert !I... |
798 |
if (!IS_ERR_OR_NULL(p) && !*pos) |
def4e38dd block: use class_... |
799 800 801 802 |
seq_puts(seqf, "major minor #blocks name "); return p; |
1da177e4c Linux-2.6.12-rc2 |
803 |
} |
cf771cb5a block: make varia... |
804 |
static int show_partition(struct seq_file *seqf, void *v) |
1da177e4c Linux-2.6.12-rc2 |
805 806 |
{ struct gendisk *sgp = v; |
e71bf0d0e block: fix disk->... |
807 808 |
struct disk_part_iter piter; struct hd_struct *part; |
1da177e4c Linux-2.6.12-rc2 |
809 |
char buf[BDEVNAME_SIZE]; |
1da177e4c Linux-2.6.12-rc2 |
810 |
/* Don't show non-partitionable removeable devices or empty devices */ |
b5d0b9df0 block: introduce ... |
811 |
if (!get_capacity(sgp) || (!disk_partitionable(sgp) && |
f331c0296 block: don't depe... |
812 |
(sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4c Linux-2.6.12-rc2 |
813 814 815 816 817 |
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 block: move stats... |
818 |
disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0e block: fix disk->... |
819 |
while ((part = disk_part_iter_next(&piter))) |
1f0142905 block: adjust for... |
820 821 |
seq_printf(seqf, "%4d %7d %10llu %s ", |
f331c0296 block: don't depe... |
822 823 824 |
MAJOR(part_devt(part)), MINOR(part_devt(part)), (unsigned long long)part->nr_sects >> 1, disk_name(sgp, part->partno, buf)); |
e71bf0d0e block: fix disk->... |
825 |
disk_part_iter_exit(&piter); |
1da177e4c Linux-2.6.12-rc2 |
826 827 828 |
return 0; } |
f500975a3 proc: move rest o... |
829 |
static const struct seq_operations partitions_op = { |
def4e38dd block: use class_... |
830 831 832 |
.start = show_partition_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
edfaa7c36 Driver core: conv... |
833 |
.show = show_partition |
1da177e4c Linux-2.6.12-rc2 |
834 |
}; |
f500975a3 proc: move rest o... |
835 836 837 838 839 840 841 842 843 844 845 846 |
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 Linux-2.6.12-rc2 |
847 |
#endif |
cf771cb5a block: make varia... |
848 |
static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4c Linux-2.6.12-rc2 |
849 |
{ |
edfaa7c36 Driver core: conv... |
850 |
if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4c Linux-2.6.12-rc2 |
851 |
/* Make old-style 2.4 aliases work */ |
edfaa7c36 Driver core: conv... |
852 |
request_module("block-major-%d", MAJOR(devt)); |
1da177e4c Linux-2.6.12-rc2 |
853 854 855 856 857 |
return NULL; } static int __init genhd_device_init(void) { |
e105b8bfc sysfs: add /sys/d... |
858 859 860 861 |
int error; block_class.dev_kobj = sysfs_dev_block_kobj; error = class_register(&block_class); |
ee27a558a genhd must_check ... |
862 863 |
if (unlikely(error)) return error; |
edfaa7c36 Driver core: conv... |
864 |
bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4c Linux-2.6.12-rc2 |
865 |
blk_dev_init(); |
edfaa7c36 Driver core: conv... |
866 |
|
561ec68e4 block: fix boot f... |
867 |
register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
edfaa7c36 Driver core: conv... |
868 |
/* create top-level block dir */ |
e52eec13c SYSFS: Allow boot... |
869 870 |
if (!sysfs_deprecated) block_depr = kobject_create_and_add("block", NULL); |
830d3cfb1 kset: convert blo... |
871 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
872 873 874 |
} subsys_initcall(genhd_device_init); |
edfaa7c36 Driver core: conv... |
875 876 |
static ssize_t disk_range_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4c Linux-2.6.12-rc2 |
877 |
{ |
edfaa7c36 Driver core: conv... |
878 |
struct gendisk *disk = dev_to_disk(dev); |
1da177e4c Linux-2.6.12-rc2 |
879 |
|
edfaa7c36 Driver core: conv... |
880 881 |
return sprintf(buf, "%d ", disk->minors); |
1da177e4c Linux-2.6.12-rc2 |
882 |
} |
1f0142905 block: adjust for... |
883 884 885 886 |
static ssize_t disk_ext_range_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
b5d0b9df0 block: introduce ... |
887 888 |
return sprintf(buf, "%d ", disk_max_parts(disk)); |
1f0142905 block: adjust for... |
889 |
} |
edfaa7c36 Driver core: conv... |
890 891 |
static ssize_t disk_removable_show(struct device *dev, struct device_attribute *attr, char *buf) |
a7fd67062 [PATCH] add sysfs... |
892 |
{ |
edfaa7c36 Driver core: conv... |
893 |
struct gendisk *disk = dev_to_disk(dev); |
a7fd67062 [PATCH] add sysfs... |
894 |
|
edfaa7c36 Driver core: conv... |
895 896 897 |
return sprintf(buf, "%d ", (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); |
a7fd67062 [PATCH] add sysfs... |
898 |
} |
1c9ce5276 block: export "ro... |
899 900 901 902 |
static ssize_t disk_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
b7db9956e block: move polic... |
903 904 |
return sprintf(buf, "%d ", get_disk_ro(disk) ? 1 : 0); |
1c9ce5276 block: export "ro... |
905 |
} |
edfaa7c36 Driver core: conv... |
906 907 |
static ssize_t disk_capability_show(struct device *dev, struct device_attribute *attr, char *buf) |
86ce18d7b genhd: expose AN ... |
908 |
{ |
edfaa7c36 Driver core: conv... |
909 910 911 912 |
struct gendisk *disk = dev_to_disk(dev); return sprintf(buf, "%x ", disk->flags); |
86ce18d7b genhd: expose AN ... |
913 |
} |
edfaa7c36 Driver core: conv... |
914 |
|
c72758f33 block: Export I/O... |
915 916 917 918 919 920 921 922 923 |
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 block: Expose dis... |
924 925 926 927 928 |
static ssize_t disk_discard_alignment_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
dd3d145d4 block: Fix discar... |
929 930 |
return sprintf(buf, "%d ", queue_discard_alignment(disk->queue)); |
86b372814 block: Expose dis... |
931 |
} |
edfaa7c36 Driver core: conv... |
932 |
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f0142905 block: adjust for... |
933 |
static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c36 Driver core: conv... |
934 |
static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce5276 block: export "ro... |
935 |
static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
e56105214 block: unify sysf... |
936 |
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
c72758f33 block: Export I/O... |
937 |
static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL); |
86b372814 block: Expose dis... |
938 939 |
static DEVICE_ATTR(discard_alignment, S_IRUGO, disk_discard_alignment_show, NULL); |
edfaa7c36 Driver core: conv... |
940 |
static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); |
074a7aca7 block: move stats... |
941 |
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315bf block: Seperate r... |
942 |
static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
c17bb4951 [PATCH] fault-inj... |
943 |
#ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c36 Driver core: conv... |
944 |
static struct device_attribute dev_attr_fail = |
eddb2e26b block: kill GENHD... |
945 |
__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
c17bb4951 [PATCH] fault-inj... |
946 |
#endif |
581d4e28d block: add fault ... |
947 948 949 950 951 |
#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 Driver core: conv... |
952 953 954 |
static struct attribute *disk_attrs[] = { &dev_attr_range.attr, |
1f0142905 block: adjust for... |
955 |
&dev_attr_ext_range.attr, |
edfaa7c36 Driver core: conv... |
956 |
&dev_attr_removable.attr, |
1c9ce5276 block: export "ro... |
957 |
&dev_attr_ro.attr, |
edfaa7c36 Driver core: conv... |
958 |
&dev_attr_size.attr, |
c72758f33 block: Export I/O... |
959 |
&dev_attr_alignment_offset.attr, |
86b372814 block: Expose dis... |
960 |
&dev_attr_discard_alignment.attr, |
edfaa7c36 Driver core: conv... |
961 962 |
&dev_attr_capability.attr, &dev_attr_stat.attr, |
316d315bf block: Seperate r... |
963 |
&dev_attr_inflight.attr, |
edfaa7c36 Driver core: conv... |
964 965 966 |
#ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif |
581d4e28d block: add fault ... |
967 968 969 |
#ifdef CONFIG_FAIL_IO_TIMEOUT &dev_attr_fail_timeout.attr, #endif |
edfaa7c36 Driver core: conv... |
970 971 972 973 974 975 |
NULL }; static struct attribute_group disk_attr_group = { .attrs = disk_attrs, }; |
a4dbd6740 driver model: con... |
976 |
static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c36 Driver core: conv... |
977 978 |
&disk_attr_group, NULL |
1da177e4c Linux-2.6.12-rc2 |
979 |
}; |
540eed563 block: make parti... |
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 |
static void disk_free_ptbl_rcu_cb(struct rcu_head *head) { struct disk_part_tbl *ptbl = container_of(head, struct disk_part_tbl, rcu_head); kfree(ptbl); } /** * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way * @disk: disk to replace part_tbl for * @new_ptbl: new part_tbl to install * * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The * original ptbl is freed using RCU callback. * * LOCKING: * Matching bd_mutx locked. */ static void disk_replace_part_tbl(struct gendisk *disk, struct disk_part_tbl *new_ptbl) { struct disk_part_tbl *old_ptbl = disk->part_tbl; rcu_assign_pointer(disk->part_tbl, new_ptbl); |
a6f23657d block: add one-hi... |
1005 1006 1007 |
if (old_ptbl) { rcu_assign_pointer(old_ptbl->last_lookup, NULL); |
540eed563 block: make parti... |
1008 |
call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb); |
a6f23657d block: add one-hi... |
1009 |
} |
540eed563 block: make parti... |
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 1045 |
} /** * 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 block: make parti... |
1046 1047 1048 1049 1050 1051 1052 1053 |
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 Driver core: conv... |
1054 |
static void disk_release(struct device *dev) |
1da177e4c Linux-2.6.12-rc2 |
1055 |
{ |
edfaa7c36 Driver core: conv... |
1056 |
struct gendisk *disk = dev_to_disk(dev); |
77ea887e4 implement in-kern... |
1057 |
disk_release_events(disk); |
1da177e4c Linux-2.6.12-rc2 |
1058 |
kfree(disk->random); |
540eed563 block: make parti... |
1059 |
disk_replace_part_tbl(disk, NULL); |
074a7aca7 block: move stats... |
1060 |
free_part_stats(&disk->part0); |
6d1d8050b block, partition:... |
1061 |
free_part_info(&disk->part0); |
1da177e4c Linux-2.6.12-rc2 |
1062 1063 |
kfree(disk); } |
edfaa7c36 Driver core: conv... |
1064 1065 |
struct class block_class = { .name = "block", |
1da177e4c Linux-2.6.12-rc2 |
1066 |
}; |
e454cea20 Driver-Core: exte... |
1067 |
static char *block_devnode(struct device *dev, mode_t *mode) |
b03f38b68 Driver Core: bloc... |
1068 1069 |
{ struct gendisk *disk = dev_to_disk(dev); |
e454cea20 Driver-Core: exte... |
1070 1071 |
if (disk->devnode) return disk->devnode(disk, mode); |
b03f38b68 Driver Core: bloc... |
1072 1073 |
return NULL; } |
1826eadfc block/genhd.c: cl... |
1074 |
static struct device_type disk_type = { |
edfaa7c36 Driver core: conv... |
1075 1076 1077 |
.name = "disk", .groups = disk_attr_groups, .release = disk_release, |
e454cea20 Driver-Core: exte... |
1078 |
.devnode = block_devnode, |
1da177e4c Linux-2.6.12-rc2 |
1079 |
}; |
a6e2ba887 block: make /proc... |
1080 |
#ifdef CONFIG_PROC_FS |
cf771cb5a block: make varia... |
1081 1082 1083 1084 1085 1086 1087 1088 |
/* * 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 Linux-2.6.12-rc2 |
1089 1090 |
{ struct gendisk *gp = v; |
e71bf0d0e block: fix disk->... |
1091 1092 |
struct disk_part_iter piter; struct hd_struct *hd; |
1da177e4c Linux-2.6.12-rc2 |
1093 |
char buf[BDEVNAME_SIZE]; |
c99590591 block: fix diskst... |
1094 |
int cpu; |
1da177e4c Linux-2.6.12-rc2 |
1095 1096 |
/* |
ed9e19823 block: implement ... |
1097 |
if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5a block: make varia... |
1098 |
seq_puts(seqf, "major minor name" |
1da177e4c Linux-2.6.12-rc2 |
1099 1100 1101 1102 1103 1104 1105 |
" rio rmerge rsect ruse wio wmerge " "wsect wuse running use aveq" " "); */ |
71982a409 block: include em... |
1106 |
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
e71bf0d0e block: fix disk->... |
1107 |
while ((hd = disk_part_iter_next(&piter))) { |
074a7aca7 block: move stats... |
1108 |
cpu = part_stat_lock(); |
c99590591 block: fix diskst... |
1109 |
part_round_stats(cpu, hd); |
074a7aca7 block: move stats... |
1110 |
part_stat_unlock(); |
1f0142905 block: adjust for... |
1111 |
seq_printf(seqf, "%4d %7d %s %lu %lu %llu " |
28f39d553 Enhanced partitio... |
1112 1113 |
"%u %lu %lu %llu %u %u %u %u ", |
f331c0296 block: don't depe... |
1114 1115 |
MAJOR(part_devt(hd)), MINOR(part_devt(hd)), disk_name(gp, hd->partno, buf), |
53f22956e block/genhd: Chan... |
1116 1117 1118 1119 1120 1121 1122 1123 |
part_stat_read(hd, ios[READ]), part_stat_read(hd, merges[READ]), (unsigned long long)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]), (unsigned long long)part_stat_read(hd, sectors[WRITE]), jiffies_to_msecs(part_stat_read(hd, ticks[WRITE])), |
316d315bf block: Seperate r... |
1124 |
part_in_flight(hd), |
28f39d553 Enhanced partitio... |
1125 1126 1127 |
jiffies_to_msecs(part_stat_read(hd, io_ticks)), jiffies_to_msecs(part_stat_read(hd, time_in_queue)) ); |
1da177e4c Linux-2.6.12-rc2 |
1128 |
} |
e71bf0d0e block: fix disk->... |
1129 |
disk_part_iter_exit(&piter); |
1da177e4c Linux-2.6.12-rc2 |
1130 1131 1132 |
return 0; } |
31d85ab28 proc: move /proc/... |
1133 |
static const struct seq_operations diskstats_op = { |
def4e38dd block: use class_... |
1134 1135 1136 |
.start = disk_seqf_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
1da177e4c Linux-2.6.12-rc2 |
1137 1138 |
.show = diskstats_show }; |
f500975a3 proc: move rest o... |
1139 |
|
31d85ab28 proc: move /proc/... |
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 |
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 proc: move rest o... |
1151 1152 |
static int __init proc_genhd_init(void) { |
31d85ab28 proc: move /proc/... |
1153 |
proc_create("diskstats", 0, NULL, &proc_diskstats_operations); |
f500975a3 proc: move rest o... |
1154 1155 1156 1157 |
proc_create("partitions", 0, NULL, &proc_partitions_operations); return 0; } module_init(proc_genhd_init); |
a6e2ba887 block: make /proc... |
1158 |
#endif /* CONFIG_PROC_FS */ |
1da177e4c Linux-2.6.12-rc2 |
1159 |
|
cf771cb5a block: make varia... |
1160 |
dev_t blk_lookup_devt(const char *name, int partno) |
a142be856 block: make blk_l... |
1161 |
{ |
def4e38dd block: use class_... |
1162 1163 1164 |
dev_t devt = MKDEV(0, 0); struct class_dev_iter iter; struct device *dev; |
a142be856 block: make blk_l... |
1165 |
|
def4e38dd block: use class_... |
1166 1167 |
class_dev_iter_init(&iter, &block_class, NULL, &disk_type); while ((dev = class_dev_iter_next(&iter))) { |
a142be856 block: make blk_l... |
1168 |
struct gendisk *disk = dev_to_disk(dev); |
548b10eb2 block: move __dev... |
1169 |
struct hd_struct *part; |
a142be856 block: make blk_l... |
1170 |
|
3ada8b7e9 block: struct dev... |
1171 |
if (strcmp(dev_name(dev), name)) |
f331c0296 block: don't depe... |
1172 |
continue; |
f331c0296 block: don't depe... |
1173 |
|
41b8c853a block: fix bootin... |
1174 1175 1176 1177 1178 1179 1180 1181 |
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 block: move __dev... |
1182 |
part = disk_get_part(disk, partno); |
2bbedcb4c block: don't test... |
1183 |
if (part) { |
f331c0296 block: don't depe... |
1184 |
devt = part_devt(part); |
e71bf0d0e block: fix disk->... |
1185 |
disk_put_part(part); |
548b10eb2 block: move __dev... |
1186 |
break; |
def4e38dd block: use class_... |
1187 |
} |
548b10eb2 block: move __dev... |
1188 |
disk_put_part(part); |
5c0ef6d02 block: drop refer... |
1189 |
} |
def4e38dd block: use class_... |
1190 |
class_dev_iter_exit(&iter); |
edfaa7c36 Driver core: conv... |
1191 1192 |
return devt; } |
edfaa7c36 Driver core: conv... |
1193 |
EXPORT_SYMBOL(blk_lookup_devt); |
1da177e4c Linux-2.6.12-rc2 |
1194 1195 |
struct gendisk *alloc_disk(int minors) { |
1946089a1 [PATCH] NUMA awar... |
1196 1197 |
return alloc_disk_node(minors, -1); } |
689d6fac4 block: replace @e... |
1198 |
EXPORT_SYMBOL(alloc_disk); |
1946089a1 [PATCH] NUMA awar... |
1199 1200 1201 1202 |
struct gendisk *alloc_disk_node(int minors, int node_id) { struct gendisk *disk; |
94f6030ca Slab allocators: ... |
1203 1204 |
disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL | __GFP_ZERO, node_id); |
1da177e4c Linux-2.6.12-rc2 |
1205 |
if (disk) { |
074a7aca7 block: move stats... |
1206 |
if (!init_part_stats(&disk->part0)) { |
1da177e4c Linux-2.6.12-rc2 |
1207 1208 1209 |
kfree(disk); return NULL; } |
bf91db18a block: set disk->... |
1210 |
disk->node_id = node_id; |
540eed563 block: make parti... |
1211 1212 |
if (disk_expand_part_tbl(disk, 0)) { free_part_stats(&disk->part0); |
b5d0b9df0 block: introduce ... |
1213 1214 |
kfree(disk); return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1215 |
} |
540eed563 block: make parti... |
1216 |
disk->part_tbl->part[0] = &disk->part0; |
6c23a9681 block: add intern... |
1217 1218 |
hd_ref_init(&disk->part0); |
b5d0b9df0 block: introduce ... |
1219 |
|
1da177e4c Linux-2.6.12-rc2 |
1220 |
disk->minors = minors; |
1da177e4c Linux-2.6.12-rc2 |
1221 |
rand_initialize_disk(disk); |
ed9e19823 block: implement ... |
1222 1223 1224 |
disk_to_dev(disk)->class = &block_class; disk_to_dev(disk)->type = &disk_type; device_initialize(disk_to_dev(disk)); |
1da177e4c Linux-2.6.12-rc2 |
1225 1226 1227 |
} return disk; } |
1946089a1 [PATCH] NUMA awar... |
1228 |
EXPORT_SYMBOL(alloc_disk_node); |
1da177e4c Linux-2.6.12-rc2 |
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 |
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 block: implement ... |
1240 |
kobj = kobject_get(&disk_to_dev(disk)->kobj); |
1da177e4c Linux-2.6.12-rc2 |
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 |
if (kobj == NULL) { module_put(owner); return NULL; } return kobj; } EXPORT_SYMBOL(get_disk); void put_disk(struct gendisk *disk) { if (disk) |
ed9e19823 block: implement ... |
1254 |
kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4c Linux-2.6.12-rc2 |
1255 1256 1257 |
} EXPORT_SYMBOL(put_disk); |
e3264a4d7 Send uevents for ... |
1258 1259 1260 1261 1262 1263 1264 1265 1266 |
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 Linux-2.6.12-rc2 |
1267 1268 |
void set_device_ro(struct block_device *bdev, int flag) { |
b7db9956e block: move polic... |
1269 |
bdev->bd_part->policy = flag; |
1da177e4c Linux-2.6.12-rc2 |
1270 1271 1272 1273 1274 1275 |
} EXPORT_SYMBOL(set_device_ro); void set_disk_ro(struct gendisk *disk, int flag) { |
e71bf0d0e block: fix disk->... |
1276 1277 |
struct disk_part_iter piter; struct hd_struct *part; |
e3264a4d7 Send uevents for ... |
1278 1279 1280 1281 1282 1283 |
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 block: fix disk->... |
1284 1285 1286 |
while ((part = disk_part_iter_next(&piter))) part->policy = flag; disk_part_iter_exit(&piter); |
1da177e4c Linux-2.6.12-rc2 |
1287 1288 1289 1290 1291 1292 1293 1294 |
} EXPORT_SYMBOL(set_disk_ro); int bdev_read_only(struct block_device *bdev) { if (!bdev) return 0; |
b7db9956e block: move polic... |
1295 |
return bdev->bd_part->policy; |
1da177e4c Linux-2.6.12-rc2 |
1296 1297 1298 |
} EXPORT_SYMBOL(bdev_read_only); |
cf771cb5a block: make varia... |
1299 |
int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4c Linux-2.6.12-rc2 |
1300 1301 |
{ int res = 0; |
cf771cb5a block: make varia... |
1302 |
struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4c Linux-2.6.12-rc2 |
1303 |
if (bdev) { |
2ef41634d [PATCH] remove do... |
1304 |
fsync_bdev(bdev); |
93b270f76 Fix over-zealous ... |
1305 |
res = __invalidate_device(bdev, true); |
1da177e4c Linux-2.6.12-rc2 |
1306 1307 1308 1309 1310 1311 |
bdput(bdev); } return res; } EXPORT_SYMBOL(invalidate_partition); |
77ea887e4 implement in-kern... |
1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 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 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 |
/* * 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; 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); } static void __disk_block_events(struct gendisk *disk, bool sync) { struct disk_events *ev = disk->ev; unsigned long flags; bool cancel; spin_lock_irqsave(&ev->lock, flags); cancel = !ev->block++; spin_unlock_irqrestore(&ev->lock, flags); if (cancel) { if (sync) cancel_delayed_work_sync(&disk->ev->dwork); else cancel_delayed_work(&disk->ev->dwork); } } static void __disk_unblock_events(struct gendisk *disk, bool check_now) { struct disk_events *ev = disk->ev; unsigned long intv; unsigned long flags; spin_lock_irqsave(&ev->lock, flags); if (WARN_ON_ONCE(ev->block <= 0)) goto out_unlock; if (--ev->block) goto out_unlock; /* * Not exactly a latency critical operation, set poll timer * slack to 25% and kick event check. */ intv = disk_events_poll_jiffies(disk); set_timer_slack(&ev->dwork.timer, intv / 4); if (check_now) queue_delayed_work(system_nrt_wq, &ev->dwork, 0); else if (intv) queue_delayed_work(system_nrt_wq, &ev->dwork, intv); out_unlock: spin_unlock_irqrestore(&ev->lock, flags); } /** * 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) { if (disk->ev) __disk_block_events(disk, true); } /** * 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 block: Don't impl... |
1444 |
__disk_unblock_events(disk, false); |
77ea887e4 implement in-kern... |
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} /** * disk_check_events - schedule immediate event checking * @disk: disk to check events for * * Schedule immediate event checking on @disk if not blocked. * * CONTEXT: * Don't care. Safe to call from irq context. */ void disk_check_events(struct gendisk *disk) { if (disk->ev) { __disk_block_events(disk, false); __disk_unblock_events(disk, true); } } EXPORT_SYMBOL_GPL(disk_check_events); /** * 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 */ __disk_block_events(disk, true); queue_delayed_work(system_nrt_wq, &ev->dwork, 0); 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) queue_delayed_work(system_nrt_wq, &ev->dwork, intv); spin_unlock_irq(&ev->lock); |
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/* * 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. */ |
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for (i = 0; i < ARRAY_SIZE(disk_uevents); i++) |
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if (events & disk->events & (1 << i)) |
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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; __disk_block_events(disk, true); 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) disk_check_events(ev->disk); 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); /* * disk_{add|del|release}_events - initialize and destroy disk_events. */ static void disk_add_events(struct gendisk *disk) { struct disk_events *ev; if (!disk->fops->check_events || !(disk->events | disk->async_events)) return; ev = kzalloc(sizeof(*ev), GFP_KERNEL); if (!ev) { pr_warn("%s: failed to initialize events ", disk->disk_name); return; } 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); kfree(ev); return; } disk->ev = ev; INIT_LIST_HEAD(&ev->node); ev->disk = disk; spin_lock_init(&ev->lock); ev->block = 1; ev->poll_msecs = -1; INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); mutex_lock(&disk_events_mutex); list_add_tail(&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); } static void disk_del_events(struct gendisk *disk) { if (!disk->ev) return; __disk_block_events(disk, true); 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); } |