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block/genhd.c
29.9 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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|
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#include "blk.h" |
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static DEFINE_MUTEX(block_class_lock); #ifndef CONFIG_SYSFS_DEPRECATED struct kobject *block_depr; #endif |
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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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/** * 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 */ static inline int major_to_index(int major) { |
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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; } /** * 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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blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk); |
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register_disk(disk); blk_register_queue(disk); |
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bdi = &disk->queue->backing_dev_info; |
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bdi_register_dev(bdi, disk_devt(disk)); |
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retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, "bdi"); |
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WARN_ON(retval); |
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} EXPORT_SYMBOL(add_disk); EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ void unlink_gendisk(struct gendisk *disk) { |
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sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
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bdi_unregister(&disk->queue->backing_dev_info); |
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blk_unregister_queue(disk); |
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blk_unregister_region(disk_devt(disk), disk->minors); |
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} |
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/** * get_gendisk - get partitioning information for a given device |
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* @devt: device to get partitioning information for |
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* @partno: returned partition index |
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* * This function gets the structure containing partitioning |
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* information for the given device @devt. |
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*/ |
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struct gendisk *get_gendisk(dev_t devt, int *partno) |
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{ |
bcce3de1b block: implement ... |
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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 ... |
564 |
part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
bcce3de1b block: implement ... |
565 566 567 568 569 570 |
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... |
571 |
|
bcce3de1b block: implement ... |
572 |
return disk; |
1da177e4c Linux-2.6.12-rc2 |
573 |
} |
f331c0296 block: don't depe... |
574 575 576 577 578 579 580 581 582 583 584 585 586 |
/** * 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... |
587 |
struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c0296 block: don't depe... |
588 |
{ |
548b10eb2 block: move __dev... |
589 590 |
struct hd_struct *part; struct block_device *bdev = NULL; |
f331c0296 block: don't depe... |
591 |
|
548b10eb2 block: move __dev... |
592 |
part = disk_get_part(disk, partno); |
2bbedcb4c block: don't test... |
593 |
if (part) |
548b10eb2 block: move __dev... |
594 595 |
bdev = bdget(part_devt(part)); disk_put_part(part); |
f331c0296 block: don't depe... |
596 |
|
548b10eb2 block: move __dev... |
597 |
return bdev; |
f331c0296 block: don't depe... |
598 599 |
} EXPORT_SYMBOL(bdget_disk); |
dd2a345f8 Display all possi... |
600 |
/* |
5c6f35c5e block: make print... |
601 602 603 604 605 606 |
* 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_... |
607 608 609 610 611 612 |
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->... |
613 614 |
struct disk_part_iter piter; struct hd_struct *part; |
1f0142905 block: adjust for... |
615 616 |
char name_buf[BDEVNAME_SIZE]; char devt_buf[BDEVT_SIZE]; |
def4e38dd block: use class_... |
617 618 619 620 621 622 623 624 625 626 627 628 629 630 |
/* * Don't show empty devices or things that have been * surpressed */ 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... |
631 632 633 |
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_... |
634 |
|
074a7aca7 block: move stats... |
635 |
printk("%s%s %10llu %s", is_part0 ? "" : " ", |
1f0142905 block: adjust for... |
636 |
bdevt_str(part_devt(part), devt_buf), |
f331c0296 block: don't depe... |
637 |
(unsigned long long)part->nr_sects >> 1, |
1f0142905 block: adjust for... |
638 |
disk_name(disk, part->partno, name_buf)); |
074a7aca7 block: move stats... |
639 640 641 642 643 644 645 646 647 648 649 650 651 |
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->... |
652 |
disk_part_iter_exit(&piter); |
def4e38dd block: use class_... |
653 654 |
} class_dev_iter_exit(&iter); |
dd2a345f8 Display all possi... |
655 |
} |
1da177e4c Linux-2.6.12-rc2 |
656 657 |
#ifdef CONFIG_PROC_FS /* iterator */ |
def4e38dd block: use class_... |
658 |
static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a78 block: make proc ... |
659 |
{ |
def4e38dd block: use class_... |
660 661 662 |
loff_t skip = *pos; struct class_dev_iter *iter; struct device *dev; |
68c4d4a78 block: make proc ... |
663 |
|
aeb3d3a81 block: kmalloc ar... |
664 |
iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38dd block: use class_... |
665 666 667 668 669 670 671 672 673 674 675 676 |
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 ... |
677 |
} |
def4e38dd block: use class_... |
678 |
static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4c Linux-2.6.12-rc2 |
679 |
{ |
edfaa7c36 Driver core: conv... |
680 |
struct device *dev; |
1da177e4c Linux-2.6.12-rc2 |
681 |
|
def4e38dd block: use class_... |
682 683 |
(*pos)++; dev = class_dev_iter_next(seqf->private); |
2ac3cee52 block: don't grab... |
684 |
if (dev) |
68c4d4a78 block: make proc ... |
685 |
return dev_to_disk(dev); |
2ac3cee52 block: don't grab... |
686 |
|
1da177e4c Linux-2.6.12-rc2 |
687 688 |
return NULL; } |
def4e38dd block: use class_... |
689 |
static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f302519 block: make /proc... |
690 |
{ |
def4e38dd block: use class_... |
691 |
struct class_dev_iter *iter = seqf->private; |
27f302519 block: make /proc... |
692 |
|
def4e38dd block: use class_... |
693 694 695 696 |
/* stop is called even after start failed :-( */ if (iter) { class_dev_iter_exit(iter); kfree(iter); |
5c0ef6d02 block: drop refer... |
697 |
} |
1da177e4c Linux-2.6.12-rc2 |
698 |
} |
def4e38dd block: use class_... |
699 |
static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4c Linux-2.6.12-rc2 |
700 |
{ |
def4e38dd block: use class_... |
701 702 703 |
static void *p; p = disk_seqf_start(seqf, pos); |
243294dae block: fix duplic... |
704 |
if (!IS_ERR(p) && p && !*pos) |
def4e38dd block: use class_... |
705 706 707 708 |
seq_puts(seqf, "major minor #blocks name "); return p; |
1da177e4c Linux-2.6.12-rc2 |
709 |
} |
cf771cb5a block: make varia... |
710 |
static int show_partition(struct seq_file *seqf, void *v) |
1da177e4c Linux-2.6.12-rc2 |
711 712 |
{ struct gendisk *sgp = v; |
e71bf0d0e block: fix disk->... |
713 714 |
struct disk_part_iter piter; struct hd_struct *part; |
1da177e4c Linux-2.6.12-rc2 |
715 |
char buf[BDEVNAME_SIZE]; |
1da177e4c Linux-2.6.12-rc2 |
716 |
/* Don't show non-partitionable removeable devices or empty devices */ |
b5d0b9df0 block: introduce ... |
717 |
if (!get_capacity(sgp) || (!disk_partitionable(sgp) && |
f331c0296 block: don't depe... |
718 |
(sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4c Linux-2.6.12-rc2 |
719 720 721 722 723 |
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... |
724 |
disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0e block: fix disk->... |
725 |
while ((part = disk_part_iter_next(&piter))) |
1f0142905 block: adjust for... |
726 727 |
seq_printf(seqf, "%4d %7d %10llu %s ", |
f331c0296 block: don't depe... |
728 729 730 |
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->... |
731 |
disk_part_iter_exit(&piter); |
1da177e4c Linux-2.6.12-rc2 |
732 733 734 |
return 0; } |
f500975a3 proc: move rest o... |
735 |
static const struct seq_operations partitions_op = { |
def4e38dd block: use class_... |
736 737 738 |
.start = show_partition_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
edfaa7c36 Driver core: conv... |
739 |
.show = show_partition |
1da177e4c Linux-2.6.12-rc2 |
740 |
}; |
f500975a3 proc: move rest o... |
741 742 743 744 745 746 747 748 749 750 751 752 |
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 |
753 |
#endif |
cf771cb5a block: make varia... |
754 |
static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4c Linux-2.6.12-rc2 |
755 |
{ |
edfaa7c36 Driver core: conv... |
756 |
if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4c Linux-2.6.12-rc2 |
757 |
/* Make old-style 2.4 aliases work */ |
edfaa7c36 Driver core: conv... |
758 |
request_module("block-major-%d", MAJOR(devt)); |
1da177e4c Linux-2.6.12-rc2 |
759 760 761 762 763 |
return NULL; } static int __init genhd_device_init(void) { |
e105b8bfc sysfs: add /sys/d... |
764 765 766 767 |
int error; block_class.dev_kobj = sysfs_dev_block_kobj; error = class_register(&block_class); |
ee27a558a genhd must_check ... |
768 769 |
if (unlikely(error)) return error; |
edfaa7c36 Driver core: conv... |
770 |
bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4c Linux-2.6.12-rc2 |
771 |
blk_dev_init(); |
edfaa7c36 Driver core: conv... |
772 |
|
561ec68e4 block: fix boot f... |
773 |
register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
edfaa7c36 Driver core: conv... |
774 775 776 777 |
#ifndef CONFIG_SYSFS_DEPRECATED /* create top-level block dir */ block_depr = kobject_create_and_add("block", NULL); #endif |
830d3cfb1 kset: convert blo... |
778 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
779 780 781 |
} subsys_initcall(genhd_device_init); |
edfaa7c36 Driver core: conv... |
782 783 |
static ssize_t disk_range_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4c Linux-2.6.12-rc2 |
784 |
{ |
edfaa7c36 Driver core: conv... |
785 |
struct gendisk *disk = dev_to_disk(dev); |
1da177e4c Linux-2.6.12-rc2 |
786 |
|
edfaa7c36 Driver core: conv... |
787 788 |
return sprintf(buf, "%d ", disk->minors); |
1da177e4c Linux-2.6.12-rc2 |
789 |
} |
1f0142905 block: adjust for... |
790 791 792 793 |
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 ... |
794 795 |
return sprintf(buf, "%d ", disk_max_parts(disk)); |
1f0142905 block: adjust for... |
796 |
} |
edfaa7c36 Driver core: conv... |
797 798 |
static ssize_t disk_removable_show(struct device *dev, struct device_attribute *attr, char *buf) |
a7fd67062 [PATCH] add sysfs... |
799 |
{ |
edfaa7c36 Driver core: conv... |
800 |
struct gendisk *disk = dev_to_disk(dev); |
a7fd67062 [PATCH] add sysfs... |
801 |
|
edfaa7c36 Driver core: conv... |
802 803 804 |
return sprintf(buf, "%d ", (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); |
a7fd67062 [PATCH] add sysfs... |
805 |
} |
1c9ce5276 block: export "ro... |
806 807 808 809 |
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... |
810 811 |
return sprintf(buf, "%d ", get_disk_ro(disk) ? 1 : 0); |
1c9ce5276 block: export "ro... |
812 |
} |
edfaa7c36 Driver core: conv... |
813 814 |
static ssize_t disk_capability_show(struct device *dev, struct device_attribute *attr, char *buf) |
86ce18d7b genhd: expose AN ... |
815 |
{ |
edfaa7c36 Driver core: conv... |
816 817 818 819 |
struct gendisk *disk = dev_to_disk(dev); return sprintf(buf, "%x ", disk->flags); |
86ce18d7b genhd: expose AN ... |
820 |
} |
edfaa7c36 Driver core: conv... |
821 |
|
c72758f33 block: Export I/O... |
822 823 824 825 826 827 828 829 830 |
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... |
831 832 833 834 835 836 837 838 839 |
static ssize_t disk_discard_alignment_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); return sprintf(buf, "%u ", queue_discard_alignment(disk->queue)); } |
edfaa7c36 Driver core: conv... |
840 |
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
1f0142905 block: adjust for... |
841 |
static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
edfaa7c36 Driver core: conv... |
842 |
static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
1c9ce5276 block: export "ro... |
843 |
static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
e56105214 block: unify sysf... |
844 |
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
c72758f33 block: Export I/O... |
845 |
static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL); |
86b372814 block: Expose dis... |
846 847 |
static DEVICE_ATTR(discard_alignment, S_IRUGO, disk_discard_alignment_show, NULL); |
edfaa7c36 Driver core: conv... |
848 |
static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); |
074a7aca7 block: move stats... |
849 |
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
316d315bf block: Seperate r... |
850 |
static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
c17bb4951 [PATCH] fault-inj... |
851 |
#ifdef CONFIG_FAIL_MAKE_REQUEST |
edfaa7c36 Driver core: conv... |
852 |
static struct device_attribute dev_attr_fail = |
eddb2e26b block: kill GENHD... |
853 |
__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
c17bb4951 [PATCH] fault-inj... |
854 |
#endif |
581d4e28d block: add fault ... |
855 856 857 858 859 |
#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... |
860 861 862 |
static struct attribute *disk_attrs[] = { &dev_attr_range.attr, |
1f0142905 block: adjust for... |
863 |
&dev_attr_ext_range.attr, |
edfaa7c36 Driver core: conv... |
864 |
&dev_attr_removable.attr, |
1c9ce5276 block: export "ro... |
865 |
&dev_attr_ro.attr, |
edfaa7c36 Driver core: conv... |
866 |
&dev_attr_size.attr, |
c72758f33 block: Export I/O... |
867 |
&dev_attr_alignment_offset.attr, |
86b372814 block: Expose dis... |
868 |
&dev_attr_discard_alignment.attr, |
edfaa7c36 Driver core: conv... |
869 870 |
&dev_attr_capability.attr, &dev_attr_stat.attr, |
316d315bf block: Seperate r... |
871 |
&dev_attr_inflight.attr, |
edfaa7c36 Driver core: conv... |
872 873 874 |
#ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif |
581d4e28d block: add fault ... |
875 876 877 |
#ifdef CONFIG_FAIL_IO_TIMEOUT &dev_attr_fail_timeout.attr, #endif |
edfaa7c36 Driver core: conv... |
878 879 880 881 882 883 |
NULL }; static struct attribute_group disk_attr_group = { .attrs = disk_attrs, }; |
a4dbd6740 driver model: con... |
884 |
static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c36 Driver core: conv... |
885 886 |
&disk_attr_group, NULL |
1da177e4c Linux-2.6.12-rc2 |
887 |
}; |
540eed563 block: make parti... |
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 |
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... |
913 914 915 |
if (old_ptbl) { rcu_assign_pointer(old_ptbl->last_lookup, NULL); |
540eed563 block: make parti... |
916 |
call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb); |
a6f23657d block: add one-hi... |
917 |
} |
540eed563 block: make parti... |
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 |
} /** * 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; INIT_RCU_HEAD(&new_ptbl->rcu_head); 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... |
964 |
static void disk_release(struct device *dev) |
1da177e4c Linux-2.6.12-rc2 |
965 |
{ |
edfaa7c36 Driver core: conv... |
966 |
struct gendisk *disk = dev_to_disk(dev); |
1da177e4c Linux-2.6.12-rc2 |
967 |
kfree(disk->random); |
540eed563 block: make parti... |
968 |
disk_replace_part_tbl(disk, NULL); |
074a7aca7 block: move stats... |
969 |
free_part_stats(&disk->part0); |
1da177e4c Linux-2.6.12-rc2 |
970 971 |
kfree(disk); } |
edfaa7c36 Driver core: conv... |
972 973 |
struct class block_class = { .name = "block", |
1da177e4c Linux-2.6.12-rc2 |
974 |
}; |
e454cea20 Driver-Core: exte... |
975 |
static char *block_devnode(struct device *dev, mode_t *mode) |
b03f38b68 Driver Core: bloc... |
976 977 |
{ struct gendisk *disk = dev_to_disk(dev); |
e454cea20 Driver-Core: exte... |
978 979 |
if (disk->devnode) return disk->devnode(disk, mode); |
b03f38b68 Driver Core: bloc... |
980 981 |
return NULL; } |
1826eadfc block/genhd.c: cl... |
982 |
static struct device_type disk_type = { |
edfaa7c36 Driver core: conv... |
983 984 985 |
.name = "disk", .groups = disk_attr_groups, .release = disk_release, |
e454cea20 Driver-Core: exte... |
986 |
.devnode = block_devnode, |
1da177e4c Linux-2.6.12-rc2 |
987 |
}; |
a6e2ba887 block: make /proc... |
988 |
#ifdef CONFIG_PROC_FS |
cf771cb5a block: make varia... |
989 990 991 992 993 994 995 996 |
/* * 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 |
997 998 |
{ struct gendisk *gp = v; |
e71bf0d0e block: fix disk->... |
999 1000 |
struct disk_part_iter piter; struct hd_struct *hd; |
1da177e4c Linux-2.6.12-rc2 |
1001 |
char buf[BDEVNAME_SIZE]; |
c99590591 block: fix diskst... |
1002 |
int cpu; |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 |
/* |
ed9e19823 block: implement ... |
1005 |
if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5a block: make varia... |
1006 |
seq_puts(seqf, "major minor name" |
1da177e4c Linux-2.6.12-rc2 |
1007 1008 1009 1010 1011 1012 1013 |
" rio rmerge rsect ruse wio wmerge " "wsect wuse running use aveq" " "); */ |
71982a409 block: include em... |
1014 |
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
e71bf0d0e block: fix disk->... |
1015 |
while ((hd = disk_part_iter_next(&piter))) { |
074a7aca7 block: move stats... |
1016 |
cpu = part_stat_lock(); |
c99590591 block: fix diskst... |
1017 |
part_round_stats(cpu, hd); |
074a7aca7 block: move stats... |
1018 |
part_stat_unlock(); |
1f0142905 block: adjust for... |
1019 |
seq_printf(seqf, "%4d %7d %s %lu %lu %llu " |
28f39d553 Enhanced partitio... |
1020 1021 |
"%u %lu %lu %llu %u %u %u %u ", |
f331c0296 block: don't depe... |
1022 1023 |
MAJOR(part_devt(hd)), MINOR(part_devt(hd)), disk_name(gp, hd->partno, buf), |
28f39d553 Enhanced partitio... |
1024 1025 1026 1027 1028 1029 1030 1031 |
part_stat_read(hd, ios[0]), part_stat_read(hd, merges[0]), (unsigned long long)part_stat_read(hd, sectors[0]), jiffies_to_msecs(part_stat_read(hd, ticks[0])), part_stat_read(hd, ios[1]), part_stat_read(hd, merges[1]), (unsigned long long)part_stat_read(hd, sectors[1]), jiffies_to_msecs(part_stat_read(hd, ticks[1])), |
316d315bf block: Seperate r... |
1032 |
part_in_flight(hd), |
28f39d553 Enhanced partitio... |
1033 1034 1035 |
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 |
1036 |
} |
e71bf0d0e block: fix disk->... |
1037 |
disk_part_iter_exit(&piter); |
1da177e4c Linux-2.6.12-rc2 |
1038 1039 1040 |
return 0; } |
31d85ab28 proc: move /proc/... |
1041 |
static const struct seq_operations diskstats_op = { |
def4e38dd block: use class_... |
1042 1043 1044 |
.start = disk_seqf_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
1da177e4c Linux-2.6.12-rc2 |
1045 1046 |
.show = diskstats_show }; |
f500975a3 proc: move rest o... |
1047 |
|
31d85ab28 proc: move /proc/... |
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 |
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... |
1059 1060 |
static int __init proc_genhd_init(void) { |
31d85ab28 proc: move /proc/... |
1061 |
proc_create("diskstats", 0, NULL, &proc_diskstats_operations); |
f500975a3 proc: move rest o... |
1062 1063 1064 1065 |
proc_create("partitions", 0, NULL, &proc_partitions_operations); return 0; } module_init(proc_genhd_init); |
a6e2ba887 block: make /proc... |
1066 |
#endif /* CONFIG_PROC_FS */ |
1da177e4c Linux-2.6.12-rc2 |
1067 |
|
8ce7ad7b2 genhd: send async... |
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 |
static void media_change_notify_thread(struct work_struct *work) { struct gendisk *gd = container_of(work, struct gendisk, async_notify); char event[] = "MEDIA_CHANGE=1"; char *envp[] = { event, NULL }; /* * set enviroment vars to indicate which event this is for * so that user space will know to go check the media status. */ |
ed9e19823 block: implement ... |
1078 |
kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); |
8ce7ad7b2 genhd: send async... |
1079 1080 |
put_device(gd->driverfs_dev); } |
1826eadfc block/genhd.c: cl... |
1081 |
#if 0 |
8ce7ad7b2 genhd: send async... |
1082 1083 1084 1085 1086 1087 |
void genhd_media_change_notify(struct gendisk *disk) { get_device(disk->driverfs_dev); schedule_work(&disk->async_notify); } EXPORT_SYMBOL_GPL(genhd_media_change_notify); |
1826eadfc block/genhd.c: cl... |
1088 |
#endif /* 0 */ |
8ce7ad7b2 genhd: send async... |
1089 |
|
cf771cb5a block: make varia... |
1090 |
dev_t blk_lookup_devt(const char *name, int partno) |
a142be856 block: make blk_l... |
1091 |
{ |
def4e38dd block: use class_... |
1092 1093 1094 |
dev_t devt = MKDEV(0, 0); struct class_dev_iter iter; struct device *dev; |
a142be856 block: make blk_l... |
1095 |
|
def4e38dd block: use class_... |
1096 1097 |
class_dev_iter_init(&iter, &block_class, NULL, &disk_type); while ((dev = class_dev_iter_next(&iter))) { |
a142be856 block: make blk_l... |
1098 |
struct gendisk *disk = dev_to_disk(dev); |
548b10eb2 block: move __dev... |
1099 |
struct hd_struct *part; |
a142be856 block: make blk_l... |
1100 |
|
3ada8b7e9 block: struct dev... |
1101 |
if (strcmp(dev_name(dev), name)) |
f331c0296 block: don't depe... |
1102 |
continue; |
f331c0296 block: don't depe... |
1103 |
|
41b8c853a block: fix bootin... |
1104 1105 1106 1107 1108 1109 1110 1111 |
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... |
1112 |
part = disk_get_part(disk, partno); |
2bbedcb4c block: don't test... |
1113 |
if (part) { |
f331c0296 block: don't depe... |
1114 |
devt = part_devt(part); |
e71bf0d0e block: fix disk->... |
1115 |
disk_put_part(part); |
548b10eb2 block: move __dev... |
1116 |
break; |
def4e38dd block: use class_... |
1117 |
} |
548b10eb2 block: move __dev... |
1118 |
disk_put_part(part); |
5c0ef6d02 block: drop refer... |
1119 |
} |
def4e38dd block: use class_... |
1120 |
class_dev_iter_exit(&iter); |
edfaa7c36 Driver core: conv... |
1121 1122 |
return devt; } |
edfaa7c36 Driver core: conv... |
1123 |
EXPORT_SYMBOL(blk_lookup_devt); |
1da177e4c Linux-2.6.12-rc2 |
1124 1125 |
struct gendisk *alloc_disk(int minors) { |
1946089a1 [PATCH] NUMA awar... |
1126 1127 |
return alloc_disk_node(minors, -1); } |
689d6fac4 block: replace @e... |
1128 |
EXPORT_SYMBOL(alloc_disk); |
1946089a1 [PATCH] NUMA awar... |
1129 1130 1131 1132 |
struct gendisk *alloc_disk_node(int minors, int node_id) { struct gendisk *disk; |
94f6030ca Slab allocators: ... |
1133 1134 |
disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL | __GFP_ZERO, node_id); |
1da177e4c Linux-2.6.12-rc2 |
1135 |
if (disk) { |
074a7aca7 block: move stats... |
1136 |
if (!init_part_stats(&disk->part0)) { |
1da177e4c Linux-2.6.12-rc2 |
1137 1138 1139 |
kfree(disk); return NULL; } |
bf91db18a block: set disk->... |
1140 |
disk->node_id = node_id; |
540eed563 block: make parti... |
1141 1142 |
if (disk_expand_part_tbl(disk, 0)) { free_part_stats(&disk->part0); |
b5d0b9df0 block: introduce ... |
1143 1144 |
kfree(disk); return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1145 |
} |
540eed563 block: make parti... |
1146 |
disk->part_tbl->part[0] = &disk->part0; |
b5d0b9df0 block: introduce ... |
1147 |
|
1da177e4c Linux-2.6.12-rc2 |
1148 |
disk->minors = minors; |
1da177e4c Linux-2.6.12-rc2 |
1149 |
rand_initialize_disk(disk); |
ed9e19823 block: implement ... |
1150 1151 1152 |
disk_to_dev(disk)->class = &block_class; disk_to_dev(disk)->type = &disk_type; device_initialize(disk_to_dev(disk)); |
8ce7ad7b2 genhd: send async... |
1153 1154 |
INIT_WORK(&disk->async_notify, media_change_notify_thread); |
1da177e4c Linux-2.6.12-rc2 |
1155 1156 1157 |
} return disk; } |
1946089a1 [PATCH] NUMA awar... |
1158 |
EXPORT_SYMBOL(alloc_disk_node); |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 |
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 ... |
1170 |
kobj = kobject_get(&disk_to_dev(disk)->kobj); |
1da177e4c Linux-2.6.12-rc2 |
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 |
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 ... |
1184 |
kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4c Linux-2.6.12-rc2 |
1185 1186 1187 |
} EXPORT_SYMBOL(put_disk); |
e3264a4d7 Send uevents for ... |
1188 1189 1190 1191 1192 1193 1194 1195 1196 |
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 |
1197 1198 |
void set_device_ro(struct block_device *bdev, int flag) { |
b7db9956e block: move polic... |
1199 |
bdev->bd_part->policy = flag; |
1da177e4c Linux-2.6.12-rc2 |
1200 1201 1202 1203 1204 1205 |
} EXPORT_SYMBOL(set_device_ro); void set_disk_ro(struct gendisk *disk, int flag) { |
e71bf0d0e block: fix disk->... |
1206 1207 |
struct disk_part_iter piter; struct hd_struct *part; |
e3264a4d7 Send uevents for ... |
1208 1209 1210 1211 1212 1213 |
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->... |
1214 1215 1216 |
while ((part = disk_part_iter_next(&piter))) part->policy = flag; disk_part_iter_exit(&piter); |
1da177e4c Linux-2.6.12-rc2 |
1217 1218 1219 1220 1221 1222 1223 1224 |
} EXPORT_SYMBOL(set_disk_ro); int bdev_read_only(struct block_device *bdev) { if (!bdev) return 0; |
b7db9956e block: move polic... |
1225 |
return bdev->bd_part->policy; |
1da177e4c Linux-2.6.12-rc2 |
1226 1227 1228 |
} EXPORT_SYMBOL(bdev_read_only); |
cf771cb5a block: make varia... |
1229 |
int invalidate_partition(struct gendisk *disk, int partno) |
1da177e4c Linux-2.6.12-rc2 |
1230 1231 |
{ int res = 0; |
cf771cb5a block: make varia... |
1232 |
struct block_device *bdev = bdget_disk(disk, partno); |
1da177e4c Linux-2.6.12-rc2 |
1233 |
if (bdev) { |
2ef41634d [PATCH] remove do... |
1234 1235 |
fsync_bdev(bdev); res = __invalidate_device(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1236 1237 1238 1239 1240 1241 |
bdput(bdev); } return res; } EXPORT_SYMBOL(invalidate_partition); |