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block/genhd.c
44.3 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 <linux/pm_runtime.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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|
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/* for extended dynamic devt allocation, currently only one major is used */ |
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#define NR_EXT_DEVT (1 << MINORBITS) |
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|
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/* For extended devt allocation. ext_devt_lock prevents look up |
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* results from going away underneath its user. */ |
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static DEFINE_SPINLOCK(ext_devt_lock); |
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static DEFINE_IDR(ext_devt_idr); |
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static struct device_type disk_type; |
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static void disk_check_events(struct disk_events *ev, unsigned int *clearing_ptr); |
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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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|
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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_read(part) && |
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!(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 && |
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sector < part->start_sect + part_nr_sects_read(part); |
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} |
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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); |
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int idx; |
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/* in consecutive minor range? */ if (part->partno < disk->minors) { *devt = MKDEV(disk->major, disk->first_minor + part->partno); return 0; } /* allocate ext devt */ |
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idr_preload(GFP_KERNEL); |
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spin_lock_bh(&ext_devt_lock); |
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idx = idr_alloc(&ext_devt_idr, part, 0, NR_EXT_DEVT, GFP_NOWAIT); |
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spin_unlock_bh(&ext_devt_lock); |
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idr_preload_end(); |
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if (idx < 0) return idx == -ENOSPC ? -EBUSY : idx; |
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|
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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) { |
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if (devt == MKDEV(0, 0)) return; if (MAJOR(devt) == BLOCK_EXT_MAJOR) { |
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spin_lock_bh(&ext_devt_lock); |
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idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
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spin_unlock_bh(&ext_devt_lock); |
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} } |
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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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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; |
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dev_set_name(ddev, "%s", disk->disk_name); |
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/* 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; } } |
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/* * avoid probable deadlock caused by allocating memory with * GFP_KERNEL in runtime_resume callback of its all ancestor * devices */ pm_runtime_set_memalloc_noio(ddev, true); |
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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)) |
d2bf1b672 block: move regis... |
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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); } |
1da177e4c Linux-2.6.12-rc2 |
546 547 548 549 550 551 |
/** * add_disk - add partitioning information to kernel list * @disk: per-device partitioning information * * This function registers the partitioning information in @disk * with the kernel. |
3e1a7ff8a block: allow disk... |
552 553 |
* * FIXME: error handling |
1da177e4c Linux-2.6.12-rc2 |
554 555 556 |
*/ void add_disk(struct gendisk *disk) { |
cf0ca9fe5 mm: bdi: export B... |
557 |
struct backing_dev_info *bdi; |
3e1a7ff8a block: allow disk... |
558 |
dev_t devt; |
6ffeea77f block: fix compil... |
559 |
int retval; |
cf0ca9fe5 mm: bdi: export B... |
560 |
|
3e1a7ff8a block: allow disk... |
561 562 563 564 565 566 |
/* 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)); |
1da177e4c Linux-2.6.12-rc2 |
567 |
disk->flags |= GENHD_FL_UP; |
3e1a7ff8a block: allow disk... |
568 569 570 571 572 573 574 575 576 577 578 579 580 |
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); |
9f53d2fe8 block: fix __blkd... |
581 |
disk_alloc_events(disk); |
9f5e48655 block:remove some... |
582 |
/* Register BDI before referencing it from bdev */ |
01ea50638 block: Fix race d... |
583 584 |
bdi = &disk->queue->backing_dev_info; bdi_register_dev(bdi, disk_devt(disk)); |
f331c0296 block: don't depe... |
585 586 |
blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk); |
1da177e4c Linux-2.6.12-rc2 |
587 588 |
register_disk(disk); blk_register_queue(disk); |
cf0ca9fe5 mm: bdi: export B... |
589 |
|
523e1d399 block: make gendi... |
590 591 592 593 |
/* * Take an extra ref on queue which will be put on disk_release() * so that it sticks around as long as @disk is there. */ |
09ac46c42 block: misc updat... |
594 |
WARN_ON_ONCE(!blk_get_queue(disk->queue)); |
523e1d399 block: make gendi... |
595 |
|
ed9e19823 block: implement ... |
596 597 |
retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, "bdi"); |
6ffeea77f block: fix compil... |
598 |
WARN_ON(retval); |
1da177e4c Linux-2.6.12-rc2 |
599 |
|
77ea887e4 implement in-kern... |
600 |
disk_add_events(disk); |
1da177e4c Linux-2.6.12-rc2 |
601 |
} |
1da177e4c Linux-2.6.12-rc2 |
602 |
EXPORT_SYMBOL(add_disk); |
1da177e4c Linux-2.6.12-rc2 |
603 |
|
d2bf1b672 block: move regis... |
604 |
void del_gendisk(struct gendisk *disk) |
1da177e4c Linux-2.6.12-rc2 |
605 |
{ |
d2bf1b672 block: move regis... |
606 607 |
struct disk_part_iter piter; struct hd_struct *part; |
77ea887e4 implement in-kern... |
608 |
disk_del_events(disk); |
d2bf1b672 block: move regis... |
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); |
d2bf1b672 block: move regis... |
619 620 |
set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; |
ed9e19823 block: implement ... |
621 |
sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
1da177e4c Linux-2.6.12-rc2 |
622 |
blk_unregister_queue(disk); |
f331c0296 block: don't depe... |
623 |
blk_unregister_region(disk_devt(disk), disk->minors); |
d2bf1b672 block: move regis... |
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))); |
25e823c8c block/genhd.c: ap... |
633 |
pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); |
d2bf1b672 block: move regis... |
634 |
device_del(disk_to_dev(disk)); |
1da177e4c Linux-2.6.12-rc2 |
635 |
} |
d2bf1b672 block: move regis... |
636 |
EXPORT_SYMBOL(del_gendisk); |
1da177e4c Linux-2.6.12-rc2 |
637 |
|
1da177e4c Linux-2.6.12-rc2 |
638 639 |
/** * get_gendisk - get partitioning information for a given device |
710027a48 Add some block/ s... |
640 |
* @devt: device to get partitioning information for |
496aa8a98 block: fix curren... |
641 |
* @partno: returned partition index |
1da177e4c Linux-2.6.12-rc2 |
642 643 |
* * This function gets the structure containing partitioning |
710027a48 Add some block/ s... |
644 |
* information for the given device @devt. |
1da177e4c Linux-2.6.12-rc2 |
645 |
*/ |
cf771cb5a block: make varia... |
646 |
struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4c Linux-2.6.12-rc2 |
647 |
{ |
bcce3de1b block: implement ... |
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; |
4d66e5e9b block: fix ext_de... |
658 |
spin_lock_bh(&ext_devt_lock); |
870d66561 block: implement ... |
659 |
part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1b block: implement ... |
660 661 662 663 |
if (part && get_disk(part_to_disk(part))) { *partno = part->partno; disk = part_to_disk(part); } |
4d66e5e9b block: fix ext_de... |
664 |
spin_unlock_bh(&ext_devt_lock); |
bcce3de1b block: implement ... |
665 |
} |
edfaa7c36 Driver core: conv... |
666 |
|
bcce3de1b block: implement ... |
667 |
return disk; |
1da177e4c Linux-2.6.12-rc2 |
668 |
} |
b6ac23af2 blkio: fix for mo... |
669 |
EXPORT_SYMBOL(get_gendisk); |
1da177e4c Linux-2.6.12-rc2 |
670 |
|
f331c0296 block: don't depe... |
671 672 673 674 675 676 677 678 679 680 681 682 683 |
/** * 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... |
684 |
struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c0296 block: don't depe... |
685 |
{ |
548b10eb2 block: move __dev... |
686 687 |
struct hd_struct *part; struct block_device *bdev = NULL; |
f331c0296 block: don't depe... |
688 |
|
548b10eb2 block: move __dev... |
689 |
part = disk_get_part(disk, partno); |
2bbedcb4c block: don't test... |
690 |
if (part) |
548b10eb2 block: move __dev... |
691 692 |
bdev = bdget(part_devt(part)); disk_put_part(part); |
f331c0296 block: don't depe... |
693 |
|
548b10eb2 block: move __dev... |
694 |
return bdev; |
f331c0296 block: don't depe... |
695 696 |
} EXPORT_SYMBOL(bdget_disk); |
dd2a345f8 Display all possi... |
697 |
/* |
5c6f35c5e block: make print... |
698 699 700 701 702 703 |
* 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_... |
704 705 706 707 708 709 |
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->... |
710 711 |
struct disk_part_iter piter; struct hd_struct *part; |
1f0142905 block: adjust for... |
712 713 |
char name_buf[BDEVNAME_SIZE]; char devt_buf[BDEVT_SIZE]; |
def4e38dd block: use class_... |
714 715 716 |
/* * Don't show empty devices or things that have been |
25985edce Fix common misspe... |
717 |
* suppressed |
def4e38dd block: use class_... |
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 block: move stats... |
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 block: use class_... |
731 |
|
b5af921ec init: add support... |
732 |
printk("%s%s %10llu %s %s", is_part0 ? "" : " ", |
1f0142905 block: adjust for... |
733 |
bdevt_str(part_devt(part), devt_buf), |
c83f6bf98 block: add partit... |
734 735 |
(unsigned long long)part_nr_sects_read(part) >> 1 , disk_name(disk, part->partno, name_buf), |
1ad7e8994 block: store part... |
736 |
part->info ? part->info->uuid : ""); |
074a7aca7 block: move stats... |
737 738 739 740 741 742 743 744 745 746 747 748 749 |
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->... |
750 |
disk_part_iter_exit(&piter); |
def4e38dd block: use class_... |
751 752 |
} class_dev_iter_exit(&iter); |
dd2a345f8 Display all possi... |
753 |
} |
1da177e4c Linux-2.6.12-rc2 |
754 755 |
#ifdef CONFIG_PROC_FS /* iterator */ |
def4e38dd block: use class_... |
756 |
static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a78 block: make proc ... |
757 |
{ |
def4e38dd block: use class_... |
758 759 760 |
loff_t skip = *pos; struct class_dev_iter *iter; struct device *dev; |
68c4d4a78 block: make proc ... |
761 |
|
aeb3d3a81 block: kmalloc ar... |
762 |
iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38dd block: use class_... |
763 764 765 766 767 768 769 770 771 772 773 774 |
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 ... |
775 |
} |
def4e38dd block: use class_... |
776 |
static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4c Linux-2.6.12-rc2 |
777 |
{ |
edfaa7c36 Driver core: conv... |
778 |
struct device *dev; |
1da177e4c Linux-2.6.12-rc2 |
779 |
|
def4e38dd block: use class_... |
780 781 |
(*pos)++; dev = class_dev_iter_next(seqf->private); |
2ac3cee52 block: don't grab... |
782 |
if (dev) |
68c4d4a78 block: make proc ... |
783 |
return dev_to_disk(dev); |
2ac3cee52 block: don't grab... |
784 |
|
1da177e4c Linux-2.6.12-rc2 |
785 786 |
return NULL; } |
def4e38dd block: use class_... |
787 |
static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f302519 block: make /proc... |
788 |
{ |
def4e38dd block: use class_... |
789 |
struct class_dev_iter *iter = seqf->private; |
27f302519 block: make /proc... |
790 |
|
def4e38dd block: use class_... |
791 792 793 794 |
/* stop is called even after start failed :-( */ if (iter) { class_dev_iter_exit(iter); kfree(iter); |
5c0ef6d02 block: drop refer... |
795 |
} |
1da177e4c Linux-2.6.12-rc2 |
796 |
} |
def4e38dd block: use class_... |
797 |
static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4c Linux-2.6.12-rc2 |
798 |
{ |
067680670 block: Don't use ... |
799 |
void *p; |
def4e38dd block: use class_... |
800 801 |
p = disk_seqf_start(seqf, pos); |
b9f985b6e block: convert !I... |
802 |
if (!IS_ERR_OR_NULL(p) && !*pos) |
def4e38dd block: use class_... |
803 804 805 806 |
seq_puts(seqf, "major minor #blocks name "); return p; |
1da177e4c Linux-2.6.12-rc2 |
807 |
} |
cf771cb5a block: make varia... |
808 |
static int show_partition(struct seq_file *seqf, void *v) |
1da177e4c Linux-2.6.12-rc2 |
809 810 |
{ struct gendisk *sgp = v; |
e71bf0d0e block: fix disk->... |
811 812 |
struct disk_part_iter piter; struct hd_struct *part; |
1da177e4c Linux-2.6.12-rc2 |
813 |
char buf[BDEVNAME_SIZE]; |
1da177e4c Linux-2.6.12-rc2 |
814 |
/* Don't show non-partitionable removeable devices or empty devices */ |
d27769ec3 block: add GENHD_... |
815 |
if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
f331c0296 block: don't depe... |
816 |
(sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4c Linux-2.6.12-rc2 |
817 818 819 820 821 |
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... |
822 |
disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0e block: fix disk->... |
823 |
while ((part = disk_part_iter_next(&piter))) |
1f0142905 block: adjust for... |
824 825 |
seq_printf(seqf, "%4d %7d %10llu %s ", |
f331c0296 block: don't depe... |
826 |
MAJOR(part_devt(part)), MINOR(part_devt(part)), |
c83f6bf98 block: add partit... |
827 |
(unsigned long long)part_nr_sects_read(part) >> 1, |
f331c0296 block: don't depe... |
828 |
disk_name(sgp, part->partno, buf)); |
e71bf0d0e block: fix disk->... |
829 |
disk_part_iter_exit(&piter); |
1da177e4c Linux-2.6.12-rc2 |
830 831 832 |
return 0; } |
f500975a3 proc: move rest o... |
833 |
static const struct seq_operations partitions_op = { |
def4e38dd block: use class_... |
834 835 836 |
.start = show_partition_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
edfaa7c36 Driver core: conv... |
837 |
.show = show_partition |
1da177e4c Linux-2.6.12-rc2 |
838 |
}; |
f500975a3 proc: move rest o... |
839 840 841 842 843 844 845 846 847 848 849 850 |
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 |
851 |
#endif |
cf771cb5a block: make varia... |
852 |
static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4c Linux-2.6.12-rc2 |
853 |
{ |
edfaa7c36 Driver core: conv... |
854 |
if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4c Linux-2.6.12-rc2 |
855 |
/* Make old-style 2.4 aliases work */ |
edfaa7c36 Driver core: conv... |
856 |
request_module("block-major-%d", MAJOR(devt)); |
1da177e4c Linux-2.6.12-rc2 |
857 858 859 860 861 |
return NULL; } static int __init genhd_device_init(void) { |
e105b8bfc sysfs: add /sys/d... |
862 863 864 865 |
int error; block_class.dev_kobj = sysfs_dev_block_kobj; error = class_register(&block_class); |
ee27a558a genhd must_check ... |
866 867 |
if (unlikely(error)) return error; |
edfaa7c36 Driver core: conv... |
868 |
bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4c Linux-2.6.12-rc2 |
869 |
blk_dev_init(); |
edfaa7c36 Driver core: conv... |
870 |
|
561ec68e4 block: fix boot f... |
871 |
register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
edfaa7c36 Driver core: conv... |
872 |
/* create top-level block dir */ |
e52eec13c SYSFS: Allow boot... |
873 874 |
if (!sysfs_deprecated) block_depr = kobject_create_and_add("block", NULL); |
830d3cfb1 kset: convert blo... |
875 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
876 877 878 |
} subsys_initcall(genhd_device_init); |
edfaa7c36 Driver core: conv... |
879 880 |
static ssize_t disk_range_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4c Linux-2.6.12-rc2 |
881 |
{ |
edfaa7c36 Driver core: conv... |
882 |
struct gendisk *disk = dev_to_disk(dev); |
1da177e4c Linux-2.6.12-rc2 |
883 |
|
edfaa7c36 Driver core: conv... |
884 885 |
return sprintf(buf, "%d ", disk->minors); |
1da177e4c Linux-2.6.12-rc2 |
886 |
} |
1f0142905 block: adjust for... |
887 888 889 890 |
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 ... |
891 892 |
return sprintf(buf, "%d ", disk_max_parts(disk)); |
1f0142905 block: adjust for... |
893 |
} |
edfaa7c36 Driver core: conv... |
894 895 |
static ssize_t disk_removable_show(struct device *dev, struct device_attribute *attr, char *buf) |
a7fd67062 [PATCH] add sysfs... |
896 |
{ |
edfaa7c36 Driver core: conv... |
897 |
struct gendisk *disk = dev_to_disk(dev); |
a7fd67062 [PATCH] add sysfs... |
898 |
|
edfaa7c36 Driver core: conv... |
899 900 901 |
return sprintf(buf, "%d ", (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); |
a7fd67062 [PATCH] add sysfs... |
902 |
} |
1c9ce5276 block: export "ro... |
903 904 905 906 |
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... |
907 908 |
return sprintf(buf, "%d ", get_disk_ro(disk) ? 1 : 0); |
1c9ce5276 block: export "ro... |
909 |
} |
edfaa7c36 Driver core: conv... |
910 911 |
static ssize_t disk_capability_show(struct device *dev, struct device_attribute *attr, char *buf) |
86ce18d7b genhd: expose AN ... |
912 |
{ |
edfaa7c36 Driver core: conv... |
913 914 915 916 |
struct gendisk *disk = dev_to_disk(dev); return sprintf(buf, "%x ", disk->flags); |
86ce18d7b genhd: expose AN ... |
917 |
} |
edfaa7c36 Driver core: conv... |
918 |
|
c72758f33 block: Export I/O... |
919 920 921 922 923 924 925 926 927 |
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... |
928 929 930 931 932 |
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... |
933 934 |
return sprintf(buf, "%d ", queue_discard_alignment(disk->queue)); |
86b372814 block: Expose dis... |
935 |
} |
edfaa7c36 Driver core: conv... |
936 |
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f0142905 block: adjust for... |
937 |
static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c36 Driver core: conv... |
938 |
static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce5276 block: export "ro... |
939 |
static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
e56105214 block: unify sysf... |
940 |
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
c72758f33 block: Export I/O... |
941 |
static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL); |
86b372814 block: Expose dis... |
942 943 |
static DEVICE_ATTR(discard_alignment, S_IRUGO, disk_discard_alignment_show, NULL); |
edfaa7c36 Driver core: conv... |
944 |
static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); |
074a7aca7 block: move stats... |
945 |
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315bf block: Seperate r... |
946 |
static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
c17bb4951 [PATCH] fault-inj... |
947 |
#ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c36 Driver core: conv... |
948 |
static struct device_attribute dev_attr_fail = |
eddb2e26b block: kill GENHD... |
949 |
__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
c17bb4951 [PATCH] fault-inj... |
950 |
#endif |
581d4e28d block: add fault ... |
951 952 953 954 955 |
#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... |
956 957 958 |
static struct attribute *disk_attrs[] = { &dev_attr_range.attr, |
1f0142905 block: adjust for... |
959 |
&dev_attr_ext_range.attr, |
edfaa7c36 Driver core: conv... |
960 |
&dev_attr_removable.attr, |
1c9ce5276 block: export "ro... |
961 |
&dev_attr_ro.attr, |
edfaa7c36 Driver core: conv... |
962 |
&dev_attr_size.attr, |
c72758f33 block: Export I/O... |
963 |
&dev_attr_alignment_offset.attr, |
86b372814 block: Expose dis... |
964 |
&dev_attr_discard_alignment.attr, |
edfaa7c36 Driver core: conv... |
965 966 |
&dev_attr_capability.attr, &dev_attr_stat.attr, |
316d315bf block: Seperate r... |
967 |
&dev_attr_inflight.attr, |
edfaa7c36 Driver core: conv... |
968 969 970 |
#ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif |
581d4e28d block: add fault ... |
971 972 973 |
#ifdef CONFIG_FAIL_IO_TIMEOUT &dev_attr_fail_timeout.attr, #endif |
edfaa7c36 Driver core: conv... |
974 975 976 977 978 979 |
NULL }; static struct attribute_group disk_attr_group = { .attrs = disk_attrs, }; |
a4dbd6740 driver model: con... |
980 |
static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c36 Driver core: conv... |
981 982 |
&disk_attr_group, NULL |
1da177e4c Linux-2.6.12-rc2 |
983 |
}; |
540eed563 block: make parti... |
984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 |
/** * 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... |
1001 1002 1003 |
if (old_ptbl) { rcu_assign_pointer(old_ptbl->last_lookup, NULL); |
57bdfbf9e block,rcu: Conver... |
1004 |
kfree_rcu(old_ptbl, rcu_head); |
a6f23657d block: add one-hi... |
1005 |
} |
540eed563 block: make parti... |
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 |
} /** * 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; |
5fabcb4c3 genhd: check for ... |
1027 |
int i, target; |
540eed563 block: make parti... |
1028 |
size_t size; |
5fabcb4c3 genhd: check for ... |
1029 1030 1031 1032 1033 1034 1035 1036 |
/* * check for int overflow, since we can get here from blkpg_ioctl() * with a user passed 'partno'. */ target = partno + 1; if (target < 0) return -EINVAL; |
540eed563 block: make parti... |
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 |
/* 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... |
1049 1050 1051 1052 1053 1054 1055 1056 |
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... |
1057 |
static void disk_release(struct device *dev) |
1da177e4c Linux-2.6.12-rc2 |
1058 |
{ |
edfaa7c36 Driver core: conv... |
1059 |
struct gendisk *disk = dev_to_disk(dev); |
2da78092d block: Fix dev_t ... |
1060 |
blk_free_devt(dev->devt); |
77ea887e4 implement in-kern... |
1061 |
disk_release_events(disk); |
1da177e4c Linux-2.6.12-rc2 |
1062 |
kfree(disk->random); |
540eed563 block: make parti... |
1063 |
disk_replace_part_tbl(disk, NULL); |
074a7aca7 block: move stats... |
1064 |
free_part_stats(&disk->part0); |
6d1d8050b block, partition:... |
1065 |
free_part_info(&disk->part0); |
523e1d399 block: make gendi... |
1066 1067 |
if (disk->queue) blk_put_queue(disk->queue); |
1da177e4c Linux-2.6.12-rc2 |
1068 1069 |
kfree(disk); } |
edfaa7c36 Driver core: conv... |
1070 1071 |
struct class block_class = { .name = "block", |
1da177e4c Linux-2.6.12-rc2 |
1072 |
}; |
3c2670e65 driver core: add ... |
1073 |
static char *block_devnode(struct device *dev, umode_t *mode, |
4e4098a3e driver core: hand... |
1074 |
kuid_t *uid, kgid_t *gid) |
b03f38b68 Driver Core: bloc... |
1075 1076 |
{ struct gendisk *disk = dev_to_disk(dev); |
e454cea20 Driver-Core: exte... |
1077 1078 |
if (disk->devnode) return disk->devnode(disk, mode); |
b03f38b68 Driver Core: bloc... |
1079 1080 |
return NULL; } |
1826eadfc block/genhd.c: cl... |
1081 |
static struct device_type disk_type = { |
edfaa7c36 Driver core: conv... |
1082 1083 1084 |
.name = "disk", .groups = disk_attr_groups, .release = disk_release, |
e454cea20 Driver-Core: exte... |
1085 |
.devnode = block_devnode, |
1da177e4c Linux-2.6.12-rc2 |
1086 |
}; |
a6e2ba887 block: make /proc... |
1087 |
#ifdef CONFIG_PROC_FS |
cf771cb5a block: make varia... |
1088 1089 1090 1091 1092 1093 1094 1095 |
/* * 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 |
1096 1097 |
{ struct gendisk *gp = v; |
e71bf0d0e block: fix disk->... |
1098 1099 |
struct disk_part_iter piter; struct hd_struct *hd; |
1da177e4c Linux-2.6.12-rc2 |
1100 |
char buf[BDEVNAME_SIZE]; |
c99590591 block: fix diskst... |
1101 |
int cpu; |
1da177e4c Linux-2.6.12-rc2 |
1102 1103 |
/* |
ed9e19823 block: implement ... |
1104 |
if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5a block: make varia... |
1105 |
seq_puts(seqf, "major minor name" |
1da177e4c Linux-2.6.12-rc2 |
1106 1107 1108 1109 1110 1111 |
" rio rmerge rsect ruse wio wmerge " "wsect wuse running use aveq" " "); */ |
9f5e48655 block:remove some... |
1112 |
|
71982a409 block: include em... |
1113 |
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
e71bf0d0e block: fix disk->... |
1114 |
while ((hd = disk_part_iter_next(&piter))) { |
074a7aca7 block: move stats... |
1115 |
cpu = part_stat_lock(); |
c99590591 block: fix diskst... |
1116 |
part_round_stats(cpu, hd); |
074a7aca7 block: move stats... |
1117 |
part_stat_unlock(); |
f95fe9cfb block/genhd.c: re... |
1118 1119 1120 |
seq_printf(seqf, "%4d %7d %s %lu %lu %lu " "%u %lu %lu %lu %u %u %u %u ", |
f331c0296 block: don't depe... |
1121 1122 |
MAJOR(part_devt(hd)), MINOR(part_devt(hd)), disk_name(gp, hd->partno, buf), |
53f22956e block/genhd: Chan... |
1123 1124 |
part_stat_read(hd, ios[READ]), part_stat_read(hd, merges[READ]), |
f95fe9cfb block/genhd.c: re... |
1125 |
part_stat_read(hd, sectors[READ]), |
53f22956e block/genhd: Chan... |
1126 1127 1128 |
jiffies_to_msecs(part_stat_read(hd, ticks[READ])), part_stat_read(hd, ios[WRITE]), part_stat_read(hd, merges[WRITE]), |
f95fe9cfb block/genhd.c: re... |
1129 |
part_stat_read(hd, sectors[WRITE]), |
53f22956e block/genhd: Chan... |
1130 |
jiffies_to_msecs(part_stat_read(hd, ticks[WRITE])), |
316d315bf block: Seperate r... |
1131 |
part_in_flight(hd), |
28f39d553 Enhanced partitio... |
1132 1133 1134 |
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 |
1135 |
} |
e71bf0d0e block: fix disk->... |
1136 |
disk_part_iter_exit(&piter); |
9f5e48655 block:remove some... |
1137 |
|
1da177e4c Linux-2.6.12-rc2 |
1138 1139 |
return 0; } |
31d85ab28 proc: move /proc/... |
1140 |
static const struct seq_operations diskstats_op = { |
def4e38dd block: use class_... |
1141 1142 1143 |
.start = disk_seqf_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
1da177e4c Linux-2.6.12-rc2 |
1144 1145 |
.show = diskstats_show }; |
f500975a3 proc: move rest o... |
1146 |
|
31d85ab28 proc: move /proc/... |
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 |
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... |
1158 1159 |
static int __init proc_genhd_init(void) { |
31d85ab28 proc: move /proc/... |
1160 |
proc_create("diskstats", 0, NULL, &proc_diskstats_operations); |
f500975a3 proc: move rest o... |
1161 1162 1163 1164 |
proc_create("partitions", 0, NULL, &proc_partitions_operations); return 0; } module_init(proc_genhd_init); |
a6e2ba887 block: make /proc... |
1165 |
#endif /* CONFIG_PROC_FS */ |
1da177e4c Linux-2.6.12-rc2 |
1166 |
|
cf771cb5a block: make varia... |
1167 |
dev_t blk_lookup_devt(const char *name, int partno) |
a142be856 block: make blk_l... |
1168 |
{ |
def4e38dd block: use class_... |
1169 1170 1171 |
dev_t devt = MKDEV(0, 0); struct class_dev_iter iter; struct device *dev; |
a142be856 block: make blk_l... |
1172 |
|
def4e38dd block: use class_... |
1173 1174 |
class_dev_iter_init(&iter, &block_class, NULL, &disk_type); while ((dev = class_dev_iter_next(&iter))) { |
a142be856 block: make blk_l... |
1175 |
struct gendisk *disk = dev_to_disk(dev); |
548b10eb2 block: move __dev... |
1176 |
struct hd_struct *part; |
a142be856 block: make blk_l... |
1177 |
|
3ada8b7e9 block: struct dev... |
1178 |
if (strcmp(dev_name(dev), name)) |
f331c0296 block: don't depe... |
1179 |
continue; |
f331c0296 block: don't depe... |
1180 |
|
41b8c853a block: fix bootin... |
1181 1182 1183 1184 1185 1186 1187 1188 |
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... |
1189 |
part = disk_get_part(disk, partno); |
2bbedcb4c block: don't test... |
1190 |
if (part) { |
f331c0296 block: don't depe... |
1191 |
devt = part_devt(part); |
e71bf0d0e block: fix disk->... |
1192 |
disk_put_part(part); |
548b10eb2 block: move __dev... |
1193 |
break; |
def4e38dd block: use class_... |
1194 |
} |
548b10eb2 block: move __dev... |
1195 |
disk_put_part(part); |
5c0ef6d02 block: drop refer... |
1196 |
} |
def4e38dd block: use class_... |
1197 |
class_dev_iter_exit(&iter); |
edfaa7c36 Driver core: conv... |
1198 1199 |
return devt; } |
edfaa7c36 Driver core: conv... |
1200 |
EXPORT_SYMBOL(blk_lookup_devt); |
1da177e4c Linux-2.6.12-rc2 |
1201 1202 |
struct gendisk *alloc_disk(int minors) { |
c304a51bf block: use NUMA_N... |
1203 |
return alloc_disk_node(minors, NUMA_NO_NODE); |
1946089a1 [PATCH] NUMA awar... |
1204 |
} |
689d6fac4 block: replace @e... |
1205 |
EXPORT_SYMBOL(alloc_disk); |
1946089a1 [PATCH] NUMA awar... |
1206 1207 1208 1209 |
struct gendisk *alloc_disk_node(int minors, int node_id) { struct gendisk *disk; |
c1b511eb2 block: Convert km... |
1210 |
disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); |
1da177e4c Linux-2.6.12-rc2 |
1211 |
if (disk) { |
074a7aca7 block: move stats... |
1212 |
if (!init_part_stats(&disk->part0)) { |
1da177e4c Linux-2.6.12-rc2 |
1213 1214 1215 |
kfree(disk); return NULL; } |
bf91db18a block: set disk->... |
1216 |
disk->node_id = node_id; |
540eed563 block: make parti... |
1217 1218 |
if (disk_expand_part_tbl(disk, 0)) { free_part_stats(&disk->part0); |
b5d0b9df0 block: introduce ... |
1219 1220 |
kfree(disk); return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1221 |
} |
540eed563 block: make parti... |
1222 |
disk->part_tbl->part[0] = &disk->part0; |
6c23a9681 block: add intern... |
1223 |
|
c83f6bf98 block: add partit... |
1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 |
/* * set_capacity() and get_capacity() currently don't use * seqcounter to read/update the part0->nr_sects. Still init * the counter as we can read the sectors in IO submission * patch using seqence counters. * * TODO: Ideally set_capacity() and get_capacity() should be * converted to make use of bd_mutex and sequence counters. */ seqcount_init(&disk->part0.nr_sects_seq); |
6c23a9681 block: add intern... |
1234 |
hd_ref_init(&disk->part0); |
b5d0b9df0 block: introduce ... |
1235 |
|
1da177e4c Linux-2.6.12-rc2 |
1236 |
disk->minors = minors; |
1da177e4c Linux-2.6.12-rc2 |
1237 |
rand_initialize_disk(disk); |
ed9e19823 block: implement ... |
1238 1239 1240 |
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 |
1241 1242 1243 |
} return disk; } |
1946089a1 [PATCH] NUMA awar... |
1244 |
EXPORT_SYMBOL(alloc_disk_node); |
1da177e4c Linux-2.6.12-rc2 |
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 |
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 ... |
1256 |
kobj = kobject_get(&disk_to_dev(disk)->kobj); |
1da177e4c Linux-2.6.12-rc2 |
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 |
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 ... |
1270 |
kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4c Linux-2.6.12-rc2 |
1271 1272 1273 |
} EXPORT_SYMBOL(put_disk); |
e3264a4d7 Send uevents for ... |
1274 1275 1276 1277 1278 1279 1280 1281 1282 |
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 |
1283 1284 |
void set_device_ro(struct block_device *bdev, int flag) { |
b7db9956e block: move polic... |
1285 |
bdev->bd_part->policy = flag; |
1da177e4c Linux-2.6.12-rc2 |
1286 1287 1288 1289 1290 1291 |
} EXPORT_SYMBOL(set_device_ro); void set_disk_ro(struct gendisk *disk, int flag) { |
e71bf0d0e block: fix disk->... |
1292 1293 |
struct disk_part_iter piter; struct hd_struct *part; |
e3264a4d7 Send uevents for ... |
1294 1295 1296 1297 1298 1299 |
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->... |
1300 1301 1302 |
while ((part = disk_part_iter_next(&piter))) part->policy = flag; disk_part_iter_exit(&piter); |
1da177e4c Linux-2.6.12-rc2 |
1303 1304 1305 1306 1307 1308 1309 1310 |
} EXPORT_SYMBOL(set_disk_ro); int bdev_read_only(struct block_device *bdev) { if (!bdev) return 0; |
b7db9956e block: move polic... |
1311 |
return bdev->bd_part->policy; |
1da177e4c Linux-2.6.12-rc2 |
1312 1313 1314 |
} EXPORT_SYMBOL(bdev_read_only); |
cf771cb5a block: make varia... |
1315 |
int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4c Linux-2.6.12-rc2 |
1316 1317 |
{ int res = 0; |
cf771cb5a block: make varia... |
1318 |
struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4c Linux-2.6.12-rc2 |
1319 |
if (bdev) { |
2ef41634d [PATCH] remove do... |
1320 |
fsync_bdev(bdev); |
93b270f76 Fix over-zealous ... |
1321 |
res = __invalidate_device(bdev, true); |
1da177e4c Linux-2.6.12-rc2 |
1322 1323 1324 1325 1326 1327 |
bdput(bdev); } return res; } EXPORT_SYMBOL(invalidate_partition); |
77ea887e4 implement in-kern... |
1328 1329 1330 1331 1332 1333 1334 1335 |
/* * 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 block: make disk_... |
1336 |
struct mutex block_mutex; /* protects blocking */ |
77ea887e4 implement in-kern... |
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 |
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 block: remove non... |
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/** * 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) |
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{ struct disk_events *ev = disk->ev; unsigned long flags; bool cancel; |
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if (!ev) return; |
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/* * Outer mutex ensures that the first blocker completes canceling * the event work before further blockers are allowed to finish. */ mutex_lock(&ev->block_mutex); |
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spin_lock_irqsave(&ev->lock, flags); cancel = !ev->block++; spin_unlock_irqrestore(&ev->lock, flags); |
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if (cancel) cancel_delayed_work_sync(&disk->ev->dwork); |
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mutex_unlock(&ev->block_mutex); |
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} 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) |
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queue_delayed_work(system_freezable_power_efficient_wq, &ev->dwork, 0); |
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else if (intv) |
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queue_delayed_work(system_freezable_power_efficient_wq, &ev->dwork, intv); |
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out_unlock: spin_unlock_irqrestore(&ev->lock, flags); } /** |
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* 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) |
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__disk_unblock_events(disk, false); |
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} /** |
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* disk_flush_events - schedule immediate event checking and flushing * @disk: disk to check and flush events for * @mask: events to flush |
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* |
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* 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. |
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* * CONTEXT: |
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* If @mask is non-zero must be called with bdev->bd_mutex held. |
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*/ |
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void disk_flush_events(struct gendisk *disk, unsigned int mask) |
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{ |
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struct disk_events *ev = disk->ev; |
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if (!ev) return; |
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spin_lock_irq(&ev->lock); ev->clearing |= mask; |
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if (!ev->block) |
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mod_delayed_work(system_freezable_power_efficient_wq, &ev->dwork, 0); |
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spin_unlock_irq(&ev->lock); |
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} |
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/** * disk_clear_events - synchronously check, clear and return pending events * @disk: disk to fetch and clear events from |
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* @mask: mask of events to be fetched and cleared |
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* * 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; |
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unsigned int clearing = mask; |
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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; } |
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disk_block_events(disk); /* * store the union of mask and ev->clearing on the stack so that the * race with disk_flush_events does not cause ambiguity (ev->clearing * can still be modified even if events are blocked). */ |
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spin_lock_irq(&ev->lock); |
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clearing |= ev->clearing; ev->clearing = 0; |
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spin_unlock_irq(&ev->lock); |
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disk_check_events(ev, &clearing); |
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/* |
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* if ev->clearing is not 0, the disk_flush_events got called in the * middle of this function, so we want to run the workfn without delay. |
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*/ |
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__disk_unblock_events(disk, ev->clearing ? true : false); |
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/* then, fetch and clear pending events */ spin_lock_irq(&ev->lock); |
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pending = ev->pending & mask; ev->pending &= ~mask; spin_unlock_irq(&ev->lock); |
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WARN_ON_ONCE(clearing & mask); |
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return pending; } |
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/* * Separate this part out so that a different pointer for clearing_ptr can be * passed in for disk_clear_events. */ |
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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); |
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disk_check_events(ev, &ev->clearing); } static void disk_check_events(struct disk_events *ev, unsigned int *clearing_ptr) { |
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struct gendisk *disk = ev->disk; char *envp[ARRAY_SIZE(disk_uevents) + 1] = { }; |
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unsigned int clearing = *clearing_ptr; |
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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; |
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*clearing_ptr &= ~clearing; |
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intv = disk_events_poll_jiffies(disk); if (!ev->block && intv) |
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queue_delayed_work(system_freezable_power_efficient_wq, &ev->dwork, intv); |
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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; |
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disk_block_events(disk); |
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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) |
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disk_flush_events(ev->disk, 0); |
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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); /* |
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* disk_{alloc|add|del|release}_events - initialize and destroy disk_events. |
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*/ |
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static void disk_alloc_events(struct gendisk *disk) |
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{ struct disk_events *ev; |
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if (!disk->fops->check_events) |
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return; ev = kzalloc(sizeof(*ev), GFP_KERNEL); if (!ev) { pr_warn("%s: failed to initialize events ", disk->disk_name); return; } |
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INIT_LIST_HEAD(&ev->node); ev->disk = disk; spin_lock_init(&ev->lock); |
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mutex_init(&ev->block_mutex); |
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ev->block = 1; ev->poll_msecs = -1; INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); |
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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); |
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mutex_lock(&disk_events_mutex); |
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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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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); } |