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block/genhd.c
58 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * gendisk handling */ |
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#include <linux/module.h> |
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#include <linux/ctype.h> |
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#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> |
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#include <linux/backing-dev.h> |
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#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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#include <linux/badblocks.h> |
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#include "blk.h" |
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static DEFINE_MUTEX(block_class_lock); |
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static struct kobject *block_depr; |
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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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/* 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 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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/* * Set disk capacity and notify if the size is not currently * zero and will not be set to zero */ |
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bool set_capacity_revalidate_and_notify(struct gendisk *disk, sector_t size, |
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bool update_bdev) |
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{ sector_t capacity = get_capacity(disk); set_capacity(disk, size); |
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if (update_bdev) revalidate_disk_size(disk, true); |
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if (capacity != size && capacity != 0 && size != 0) { char *envp[] = { "RESIZE=1", NULL }; kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); |
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return true; |
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} |
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return false; |
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} EXPORT_SYMBOL_GPL(set_capacity_revalidate_and_notify); |
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/* * Format the device name of the indicated disk into the supplied buffer and * return a pointer to that same buffer for convenience. */ char *disk_name(struct gendisk *hd, int partno, char *buf) { if (!partno) snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name); else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno); else snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); return buf; } const char *bdevname(struct block_device *bdev, char *buf) { |
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return disk_name(bdev->bd_disk, bdev->bd_partno, buf); |
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} EXPORT_SYMBOL(bdevname); |
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static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat) { int cpu; memset(stat, 0, sizeof(struct disk_stats)); for_each_possible_cpu(cpu) { struct disk_stats *ptr = per_cpu_ptr(part->dkstats, cpu); int group; for (group = 0; group < NR_STAT_GROUPS; group++) { stat->nsecs[group] += ptr->nsecs[group]; stat->sectors[group] += ptr->sectors[group]; stat->ios[group] += ptr->ios[group]; stat->merges[group] += ptr->merges[group]; } stat->io_ticks += ptr->io_ticks; |
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} } |
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static unsigned int part_in_flight(struct hd_struct *part) |
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{ |
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unsigned int inflight = 0; |
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int cpu; |
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for_each_possible_cpu(cpu) { |
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inflight += part_stat_local_read_cpu(part, in_flight[0], cpu) + part_stat_local_read_cpu(part, in_flight[1], cpu); |
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} |
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if ((int)inflight < 0) inflight = 0; |
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return inflight; |
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} |
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static void part_in_flight_rw(struct hd_struct *part, unsigned int inflight[2]) |
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{ |
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int cpu; |
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inflight[0] = 0; inflight[1] = 0; for_each_possible_cpu(cpu) { inflight[0] += part_stat_local_read_cpu(part, in_flight[0], cpu); inflight[1] += part_stat_local_read_cpu(part, in_flight[1], cpu); } if ((int)inflight[0] < 0) inflight[0] = 0; if ((int)inflight[1] < 0) inflight[1] = 0; |
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} |
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struct hd_struct *__disk_get_part(struct gendisk *disk, int partno) { struct disk_part_tbl *ptbl = rcu_dereference(disk->part_tbl); if (unlikely(partno < 0 || partno >= ptbl->len)) return NULL; return rcu_dereference(ptbl->part[partno]); } |
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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; |
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rcu_read_lock(); |
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part = __disk_get_part(disk, partno); if (part) get_device(part_to_dev(part)); |
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rcu_read_unlock(); return part; } |
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/** * 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: |
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* RCU read locked. The returned partition pointer is always valid |
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* because its refcount is grabbed except for part0, which lifetime * is same with the disk. |
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* * RETURNS: |
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* Found partition on success, part0 is returned if no partition matches |
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* or the matched partition is being deleted. |
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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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rcu_read_lock(); |
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ptbl = rcu_dereference(disk->part_tbl); |
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part = rcu_dereference(ptbl->last_lookup); |
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if (part && sector_in_part(part, sector) && hd_struct_try_get(part)) |
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goto out_unlock; |
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for (i = 1; i < ptbl->len; i++) { |
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part = rcu_dereference(ptbl->part[i]); |
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if (part && sector_in_part(part, sector)) { |
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/* * only live partition can be cached for lookup, * so use-after-free on cached & deleting partition * can be avoided */ if (!hd_struct_try_get(part)) break; |
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rcu_assign_pointer(ptbl->last_lookup, part); |
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goto out_unlock; |
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} |
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} |
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part = &disk->part0; out_unlock: rcu_read_unlock(); return part; |
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} |
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/** * disk_has_partitions * @disk: gendisk of interest * * Walk through the partition table and check if valid partition exists. * * CONTEXT: * Don't care. * * RETURNS: * True if the gendisk has at least one valid non-zero size partition. * Otherwise false. */ bool disk_has_partitions(struct gendisk *disk) { struct disk_part_tbl *ptbl; int i; bool ret = false; rcu_read_lock(); ptbl = rcu_dereference(disk->part_tbl); /* Iterate partitions skipping the whole device at index 0 */ for (i = 1; i < ptbl->len; i++) { if (rcu_dereference(ptbl->part[i])) { ret = true; break; } } rcu_read_unlock(); return ret; } EXPORT_SYMBOL_GPL(disk_has_partitions); |
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/* * Can be deleted altogether. Later. * */ |
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#define BLKDEV_MAJOR_HASH_SIZE 255 |
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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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mutex_lock(&block_class_lock); for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next) if (dp->major == offset) |
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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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#endif /* CONFIG_PROC_FS */ |
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/** * register_blkdev - register a new block device * |
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* @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If * @major = 0, try to allocate any unused major number. |
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* @name: the name of the new block device as a zero terminated string * * The @name must be unique within the system. * |
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* The return value depends on the @major input parameter: * |
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* - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1] * then the function returns zero on success, or a negative error code |
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* - if any unused major number was requested with @major = 0 parameter |
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* then the return value is the allocated major number in range |
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* [1..BLKDEV_MAJOR_MAX-1] or a negative error code otherwise * * See Documentation/admin-guide/devices.txt for the list of allocated * major numbers. |
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*/ |
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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) { |
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printk("%s: failed to get major for %s ", __func__, name); |
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ret = -EBUSY; goto out; } major = index; ret = major; } |
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if (major >= BLKDEV_MAJOR_MAX) { |
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pr_err("%s: major requested (%u) is greater than the maximum (%u) for %s ", __func__, major, BLKDEV_MAJOR_MAX-1, name); |
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ret = -EINVAL; goto out; } |
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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) { |
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printk("register_blkdev: cannot get major %u for %s ", |
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major, name); kfree(p); } out: |
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mutex_unlock(&block_class_lock); |
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return ret; } EXPORT_SYMBOL(register_blkdev); |
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void unregister_blkdev(unsigned int major, const char *name) |
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{ struct blk_major_name **n; struct blk_major_name *p = NULL; int index = major_to_index(major); |
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mutex_lock(&block_class_lock); |
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for (n = &major_names[index]; *n; n = &(*n)->next) if ((*n)->major == major) break; |
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if (!*n || strcmp((*n)->name, name)) { WARN_ON(1); |
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} else { |
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p = *n; *n = p->next; } |
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mutex_unlock(&block_class_lock); |
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kfree(p); |
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} EXPORT_SYMBOL(unregister_blkdev); static struct kobj_map *bdev_map; |
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/** |
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* blk_mangle_minor - scatter minor numbers apart * @minor: minor number to mangle * * Scatter consecutively allocated @minor number apart if MANGLE_DEVT * is enabled. Mangling twice gives the original value. * * RETURNS: * Mangled value. * * CONTEXT: * Don't care. */ static int blk_mangle_minor(int minor) { #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT int i; for (i = 0; i < MINORBITS / 2; i++) { int low = minor & (1 << i); int high = minor & (1 << (MINORBITS - 1 - i)); int distance = MINORBITS - 1 - 2 * i; minor ^= low | high; /* clear both bits */ low <<= distance; /* swap the positions */ high >>= distance; minor |= low | high; /* and set */ } #endif return minor; } /** |
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* blk_alloc_devt - allocate a dev_t for a partition * @part: partition to allocate dev_t for |
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* @devt: out parameter for resulting dev_t * * Allocate a dev_t for block device. * * RETURNS: * 0 on success, allocated dev_t is returned in *@devt. -errno on * failure. * * CONTEXT: * Might sleep. */ int blk_alloc_devt(struct hd_struct *part, dev_t *devt) { struct gendisk *disk = part_to_disk(part); |
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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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|
566 |
spin_unlock_bh(&ext_devt_lock); |
2da78092d
|
567 568 |
idr_preload_end(); |
bab998d62
|
569 570 |
if (idx < 0) return idx == -ENOSPC ? -EBUSY : idx; |
bcce3de1b
|
571 |
|
870d66561
|
572 |
*devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
bcce3de1b
|
573 574 575 576 577 578 579 580 581 582 583 584 585 586 |
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) { |
bcce3de1b
|
587 588 589 590 |
if (devt == MKDEV(0, 0)) return; if (MAJOR(devt) == BLOCK_EXT_MAJOR) { |
4d66e5e9b
|
591 |
spin_lock_bh(&ext_devt_lock); |
870d66561
|
592 |
idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
4d66e5e9b
|
593 |
spin_unlock_bh(&ext_devt_lock); |
bcce3de1b
|
594 595 |
} } |
33c826ef1
|
596 597 |
/* * We invalidate devt by assigning NULL pointer for devt in idr. |
6fcc44d1d
|
598 599 600 601 602 603 604 605 606 |
*/ void blk_invalidate_devt(dev_t devt) { if (MAJOR(devt) == BLOCK_EXT_MAJOR) { spin_lock_bh(&ext_devt_lock); idr_replace(&ext_devt_idr, NULL, blk_mangle_minor(MINOR(devt))); spin_unlock_bh(&ext_devt_lock); } } |
1f0142905
|
607 608 609 610 611 612 613 614 615 616 617 |
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; } |
1da177e4c
|
618 619 620 621 622 |
/* * Register device numbers dev..(dev+range-1) * range must be nonzero * The hash chain is sorted on range, so that subranges can override. */ |
edfaa7c36
|
623 |
void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
1da177e4c
|
624 625 626 |
struct kobject *(*probe)(dev_t, int *, void *), int (*lock)(dev_t, void *), void *data) { |
edfaa7c36
|
627 |
kobj_map(bdev_map, devt, range, module, probe, lock, data); |
1da177e4c
|
628 629 630 |
} EXPORT_SYMBOL(blk_register_region); |
edfaa7c36
|
631 |
void blk_unregister_region(dev_t devt, unsigned long range) |
1da177e4c
|
632 |
{ |
edfaa7c36
|
633 |
kobj_unmap(bdev_map, devt, range); |
1da177e4c
|
634 635 636 |
} EXPORT_SYMBOL(blk_unregister_region); |
cf771cb5a
|
637 |
static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
1da177e4c
|
638 639 |
{ struct gendisk *p = data; |
edfaa7c36
|
640 |
|
ed9e19823
|
641 |
return &disk_to_dev(p)->kobj; |
1da177e4c
|
642 |
} |
edfaa7c36
|
643 |
static int exact_lock(dev_t devt, void *data) |
1da177e4c
|
644 645 |
{ struct gendisk *p = data; |
3079c22ea
|
646 |
if (!get_disk_and_module(p)) |
1da177e4c
|
647 648 649 |
return -1; return 0; } |
9301fe734
|
650 651 652 653 654 655 656 657 658 659 660 661 |
static void disk_scan_partitions(struct gendisk *disk) { struct block_device *bdev; if (!get_capacity(disk) || !disk_part_scan_enabled(disk)) return; set_bit(GD_NEED_PART_SCAN, &disk->state); bdev = blkdev_get_by_dev(disk_devt(disk), FMODE_READ, NULL); if (!IS_ERR(bdev)) blkdev_put(bdev, FMODE_READ); } |
fef912bf8
|
662 663 |
static void register_disk(struct device *parent, struct gendisk *disk, const struct attribute_group **groups) |
d2bf1b672
|
664 665 |
{ struct device *ddev = disk_to_dev(disk); |
d2bf1b672
|
666 667 668 |
struct disk_part_iter piter; struct hd_struct *part; int err; |
e63a46bef
|
669 |
ddev->parent = parent; |
d2bf1b672
|
670 |
|
ffc8b3086
|
671 |
dev_set_name(ddev, "%s", disk->disk_name); |
d2bf1b672
|
672 673 674 |
/* delay uevents, until we scanned partition table */ dev_set_uevent_suppress(ddev, 1); |
fef912bf8
|
675 676 677 678 |
if (groups) { WARN_ON(ddev->groups); ddev->groups = groups; } |
d2bf1b672
|
679 680 681 682 683 684 685 686 687 688 |
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; } } |
25e823c8c
|
689 690 691 692 693 694 695 |
/* * 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); |
d2bf1b672
|
696 697 |
disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); |
8ddcd6532
|
698 699 700 701 |
if (disk->flags & GENHD_FL_HIDDEN) { dev_set_uevent_suppress(ddev, 0); return; } |
9301fe734
|
702 |
disk_scan_partitions(disk); |
d2bf1b672
|
703 |
|
d2bf1b672
|
704 705 706 707 708 709 710 711 712 |
/* 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); |
8ddcd6532
|
713 |
|
4d7c1d3fd
|
714 715 716 717 718 719 |
if (disk->queue->backing_dev_info->dev) { err = sysfs_create_link(&ddev->kobj, &disk->queue->backing_dev_info->dev->kobj, "bdi"); WARN_ON(err); } |
d2bf1b672
|
720 |
} |
1da177e4c
|
721 |
/** |
fa70d2e2c
|
722 |
* __device_add_disk - add disk information to kernel list |
e63a46bef
|
723 |
* @parent: parent device for the disk |
1da177e4c
|
724 |
* @disk: per-device partitioning information |
fef912bf8
|
725 |
* @groups: Additional per-device sysfs groups |
fa70d2e2c
|
726 |
* @register_queue: register the queue if set to true |
1da177e4c
|
727 728 729 |
* * This function registers the partitioning information in @disk * with the kernel. |
3e1a7ff8a
|
730 731 |
* * FIXME: error handling |
1da177e4c
|
732 |
*/ |
fa70d2e2c
|
733 |
static void __device_add_disk(struct device *parent, struct gendisk *disk, |
fef912bf8
|
734 |
const struct attribute_group **groups, |
fa70d2e2c
|
735 |
bool register_queue) |
1da177e4c
|
736 |
{ |
3e1a7ff8a
|
737 |
dev_t devt; |
6ffeea77f
|
738 |
int retval; |
cf0ca9fe5
|
739 |
|
737eb78e8
|
740 741 742 743 744 745 746 747 |
/* * The disk queue should now be all set with enough information about * the device for the elevator code to pick an adequate default * elevator if one is needed, that is, for devices requesting queue * registration. */ if (register_queue) elevator_init_mq(disk->queue); |
3e1a7ff8a
|
748 749 750 751 752 |
/* 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)); |
8ddcd6532
|
753 754 |
WARN_ON(!disk->minors && !(disk->flags & (GENHD_FL_EXT_DEVT | GENHD_FL_HIDDEN))); |
3e1a7ff8a
|
755 |
|
1da177e4c
|
756 |
disk->flags |= GENHD_FL_UP; |
3e1a7ff8a
|
757 758 759 760 761 762 |
retval = blk_alloc_devt(&disk->part0, &devt); if (retval) { WARN_ON(1); return; } |
3e1a7ff8a
|
763 764 |
disk->major = MAJOR(devt); disk->first_minor = MINOR(devt); |
9f53d2fe8
|
765 |
disk_alloc_events(disk); |
8ddcd6532
|
766 767 768 769 770 771 772 773 |
if (disk->flags & GENHD_FL_HIDDEN) { /* * Don't let hidden disks show up in /proc/partitions, * and don't bother scanning for partitions either. */ disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO; disk->flags |= GENHD_FL_NO_PART_SCAN; } else { |
3c5d202b5
|
774 775 |
struct backing_dev_info *bdi = disk->queue->backing_dev_info; struct device *dev = disk_to_dev(disk); |
3a92168bc
|
776 |
int ret; |
8ddcd6532
|
777 |
/* Register BDI before referencing it from bdev */ |
3c5d202b5
|
778 779 |
dev->devt = devt; ret = bdi_register(bdi, "%u:%u", MAJOR(devt), MINOR(devt)); |
3a92168bc
|
780 |
WARN_ON(ret); |
3c5d202b5
|
781 |
bdi_set_owner(bdi, dev); |
8ddcd6532
|
782 783 784 |
blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk); } |
fef912bf8
|
785 |
register_disk(parent, disk, groups); |
fa70d2e2c
|
786 787 |
if (register_queue) blk_register_queue(disk); |
cf0ca9fe5
|
788 |
|
523e1d399
|
789 790 791 792 |
/* * 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
|
793 |
WARN_ON_ONCE(!blk_get_queue(disk->queue)); |
523e1d399
|
794 |
|
77ea887e4
|
795 |
disk_add_events(disk); |
25520d55c
|
796 |
blk_integrity_add(disk); |
1da177e4c
|
797 |
} |
fa70d2e2c
|
798 |
|
fef912bf8
|
799 800 |
void device_add_disk(struct device *parent, struct gendisk *disk, const struct attribute_group **groups) |
fa70d2e2c
|
801 |
{ |
fef912bf8
|
802 |
__device_add_disk(parent, disk, groups, true); |
fa70d2e2c
|
803 |
} |
e63a46bef
|
804 |
EXPORT_SYMBOL(device_add_disk); |
1da177e4c
|
805 |
|
fa70d2e2c
|
806 807 |
void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk) { |
fef912bf8
|
808 |
__device_add_disk(parent, disk, NULL, false); |
fa70d2e2c
|
809 810 |
} EXPORT_SYMBOL(device_add_disk_no_queue_reg); |
02d33b677
|
811 812 813 814 815 816 817 818 819 820 |
static void invalidate_partition(struct gendisk *disk, int partno) { struct block_device *bdev; bdev = bdget_disk(disk, partno); if (!bdev) return; fsync_bdev(bdev); __invalidate_device(bdev, true); |
9bc5c397d
|
821 822 823 824 825 826 |
/* * Unhash the bdev inode for this device so that it gets evicted as soon * as last inode reference is dropped. */ remove_inode_hash(bdev->bd_inode); |
02d33b677
|
827 828 |
bdput(bdev); } |
b5bd357cf
|
829 830 831 832 833 834 835 836 837 838 839 840 841 |
/** * del_gendisk - remove the gendisk * @disk: the struct gendisk to remove * * Removes the gendisk and all its associated resources. This deletes the * partitions associated with the gendisk, and unregisters the associated * request_queue. * * This is the counter to the respective __device_add_disk() call. * * The final removal of the struct gendisk happens when its refcount reaches 0 * with put_disk(), which should be called after del_gendisk(), if * __device_add_disk() was used. |
e8c7d14ac
|
842 843 844 845 846 |
* * Drivers exist which depend on the release of the gendisk to be synchronous, * it should not be deferred. * * Context: can sleep |
b5bd357cf
|
847 |
*/ |
d2bf1b672
|
848 |
void del_gendisk(struct gendisk *disk) |
1da177e4c
|
849 |
{ |
d2bf1b672
|
850 851 |
struct disk_part_iter piter; struct hd_struct *part; |
e8c7d14ac
|
852 |
might_sleep(); |
25520d55c
|
853 |
blk_integrity_del(disk); |
77ea887e4
|
854 |
disk_del_events(disk); |
56c0908c8
|
855 856 857 858 859 |
/* * Block lookups of the disk until all bdevs are unhashed and the * disk is marked as dead (GENHD_FL_UP cleared). */ down_write(&disk->lookup_sem); |
d2bf1b672
|
860 861 862 863 864 |
/* 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); |
8328eb283
|
865 |
delete_partition(part); |
d2bf1b672
|
866 867 868 869 |
} disk_part_iter_exit(&piter); invalidate_partition(disk, 0); |
d2bf1b672
|
870 871 |
set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; |
56c0908c8
|
872 |
up_write(&disk->lookup_sem); |
d2bf1b672
|
873 |
|
8ddcd6532
|
874 875 |
if (!(disk->flags & GENHD_FL_HIDDEN)) sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
90f16fddc
|
876 877 878 879 880 |
if (disk->queue) { /* * Unregister bdi before releasing device numbers (as they can * get reused and we'd get clashes in sysfs). */ |
bc8d062c3
|
881 882 |
if (!(disk->flags & GENHD_FL_HIDDEN)) bdi_unregister(disk->queue->backing_dev_info); |
90f16fddc
|
883 884 885 886 |
blk_unregister_queue(disk); } else { WARN_ON(1); } |
d2bf1b672
|
887 |
|
17eac0996
|
888 |
if (!(disk->flags & GENHD_FL_HIDDEN)) |
8ddcd6532
|
889 |
blk_unregister_region(disk_devt(disk), disk->minors); |
6fcc44d1d
|
890 891 892 893 894 895 896 |
/* * Remove gendisk pointer from idr so that it cannot be looked up * while RCU period before freeing gendisk is running to prevent * use-after-free issues. Note that the device number stays * "in-use" until we really free the gendisk. */ blk_invalidate_devt(disk_devt(disk)); |
d2bf1b672
|
897 898 899 |
kobject_put(disk->part0.holder_dir); kobject_put(disk->slave_dir); |
d2bf1b672
|
900 901 902 |
part_stat_set_all(&disk->part0, 0); disk->part0.stamp = 0; |
d2bf1b672
|
903 904 |
if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
25e823c8c
|
905 |
pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); |
d2bf1b672
|
906 |
device_del(disk_to_dev(disk)); |
1da177e4c
|
907 |
} |
d2bf1b672
|
908 |
EXPORT_SYMBOL(del_gendisk); |
1da177e4c
|
909 |
|
99e6608c9
|
910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 |
/* sysfs access to bad-blocks list. */ static ssize_t disk_badblocks_show(struct device *dev, struct device_attribute *attr, char *page) { struct gendisk *disk = dev_to_disk(dev); if (!disk->bb) return sprintf(page, " "); return badblocks_show(disk->bb, page, 0); } static ssize_t disk_badblocks_store(struct device *dev, struct device_attribute *attr, const char *page, size_t len) { struct gendisk *disk = dev_to_disk(dev); if (!disk->bb) return -ENXIO; return badblocks_store(disk->bb, page, len, 0); } |
1da177e4c
|
935 936 |
/** * get_gendisk - get partitioning information for a given device |
710027a48
|
937 |
* @devt: device to get partitioning information for |
496aa8a98
|
938 |
* @partno: returned partition index |
1da177e4c
|
939 940 |
* * This function gets the structure containing partitioning |
710027a48
|
941 |
* information for the given device @devt. |
763b58923
|
942 943 |
* * Context: can sleep |
1da177e4c
|
944 |
*/ |
cf771cb5a
|
945 |
struct gendisk *get_gendisk(dev_t devt, int *partno) |
1da177e4c
|
946 |
{ |
bcce3de1b
|
947 |
struct gendisk *disk = NULL; |
763b58923
|
948 |
might_sleep(); |
bcce3de1b
|
949 950 951 952 953 954 955 956 |
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
|
957 |
spin_lock_bh(&ext_devt_lock); |
870d66561
|
958 |
part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
3079c22ea
|
959 |
if (part && get_disk_and_module(part_to_disk(part))) { |
bcce3de1b
|
960 961 962 |
*partno = part->partno; disk = part_to_disk(part); } |
4d66e5e9b
|
963 |
spin_unlock_bh(&ext_devt_lock); |
bcce3de1b
|
964 |
} |
edfaa7c36
|
965 |
|
56c0908c8
|
966 967 968 969 970 971 972 973 974 975 976 |
if (!disk) return NULL; /* * Synchronize with del_gendisk() to not return disk that is being * destroyed. */ down_read(&disk->lookup_sem); if (unlikely((disk->flags & GENHD_FL_HIDDEN) || !(disk->flags & GENHD_FL_UP))) { up_read(&disk->lookup_sem); |
9df6c2991
|
977 |
put_disk_and_module(disk); |
8ddcd6532
|
978 |
disk = NULL; |
56c0908c8
|
979 980 |
} else { up_read(&disk->lookup_sem); |
8ddcd6532
|
981 |
} |
bcce3de1b
|
982 |
return disk; |
1da177e4c
|
983 |
} |
f331c0296
|
984 985 986 987 988 989 990 991 992 993 994 995 996 |
/** * 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
|
997 |
struct block_device *bdget_disk(struct gendisk *disk, int partno) |
f331c0296
|
998 |
{ |
548b10eb2
|
999 1000 |
struct hd_struct *part; struct block_device *bdev = NULL; |
f331c0296
|
1001 |
|
548b10eb2
|
1002 |
part = disk_get_part(disk, partno); |
2bbedcb4c
|
1003 |
if (part) |
10ed16662
|
1004 |
bdev = bdget_part(part); |
548b10eb2
|
1005 |
disk_put_part(part); |
f331c0296
|
1006 |
|
548b10eb2
|
1007 |
return bdev; |
f331c0296
|
1008 1009 |
} EXPORT_SYMBOL(bdget_disk); |
dd2a345f8
|
1010 |
/* |
5c6f35c5e
|
1011 1012 1013 1014 1015 1016 |
* 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
|
1017 1018 1019 1020 1021 1022 |
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
|
1023 1024 |
struct disk_part_iter piter; struct hd_struct *part; |
1f0142905
|
1025 1026 |
char name_buf[BDEVNAME_SIZE]; char devt_buf[BDEVT_SIZE]; |
def4e38dd
|
1027 1028 1029 |
/* * Don't show empty devices or things that have been |
25985edce
|
1030 |
* suppressed |
def4e38dd
|
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 |
*/ 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
|
1041 1042 1043 |
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); while ((part = disk_part_iter_next(&piter))) { bool is_part0 = part == &disk->part0; |
def4e38dd
|
1044 |
|
b5af921ec
|
1045 |
printk("%s%s %10llu %s %s", is_part0 ? "" : " ", |
1f0142905
|
1046 |
bdevt_str(part_devt(part), devt_buf), |
c83f6bf98
|
1047 1048 |
(unsigned long long)part_nr_sects_read(part) >> 1 , disk_name(disk, part->partno, name_buf), |
1ad7e8994
|
1049 |
part->info ? part->info->uuid : ""); |
074a7aca7
|
1050 |
if (is_part0) { |
52c44d93c
|
1051 |
if (dev->parent && dev->parent->driver) |
074a7aca7
|
1052 1053 |
printk(" driver: %s ", |
52c44d93c
|
1054 |
dev->parent->driver->name); |
074a7aca7
|
1055 1056 1057 1058 1059 1060 1061 |
else printk(" (driver?) "); } else printk(" "); } |
e71bf0d0e
|
1062 |
disk_part_iter_exit(&piter); |
def4e38dd
|
1063 1064 |
} class_dev_iter_exit(&iter); |
dd2a345f8
|
1065 |
} |
1da177e4c
|
1066 1067 |
#ifdef CONFIG_PROC_FS /* iterator */ |
def4e38dd
|
1068 |
static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
68c4d4a78
|
1069 |
{ |
def4e38dd
|
1070 1071 1072 |
loff_t skip = *pos; struct class_dev_iter *iter; struct device *dev; |
68c4d4a78
|
1073 |
|
aeb3d3a81
|
1074 |
iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
def4e38dd
|
1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 |
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
|
1087 |
} |
def4e38dd
|
1088 |
static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
1da177e4c
|
1089 |
{ |
edfaa7c36
|
1090 |
struct device *dev; |
1da177e4c
|
1091 |
|
def4e38dd
|
1092 1093 |
(*pos)++; dev = class_dev_iter_next(seqf->private); |
2ac3cee52
|
1094 |
if (dev) |
68c4d4a78
|
1095 |
return dev_to_disk(dev); |
2ac3cee52
|
1096 |
|
1da177e4c
|
1097 1098 |
return NULL; } |
def4e38dd
|
1099 |
static void disk_seqf_stop(struct seq_file *seqf, void *v) |
27f302519
|
1100 |
{ |
def4e38dd
|
1101 |
struct class_dev_iter *iter = seqf->private; |
27f302519
|
1102 |
|
def4e38dd
|
1103 1104 1105 1106 |
/* stop is called even after start failed :-( */ if (iter) { class_dev_iter_exit(iter); kfree(iter); |
77da16053
|
1107 |
seqf->private = NULL; |
5c0ef6d02
|
1108 |
} |
1da177e4c
|
1109 |
} |
def4e38dd
|
1110 |
static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
1da177e4c
|
1111 |
{ |
067680670
|
1112 |
void *p; |
def4e38dd
|
1113 1114 |
p = disk_seqf_start(seqf, pos); |
b9f985b6e
|
1115 |
if (!IS_ERR_OR_NULL(p) && !*pos) |
def4e38dd
|
1116 1117 1118 1119 |
seq_puts(seqf, "major minor #blocks name "); return p; |
1da177e4c
|
1120 |
} |
cf771cb5a
|
1121 |
static int show_partition(struct seq_file *seqf, void *v) |
1da177e4c
|
1122 1123 |
{ struct gendisk *sgp = v; |
e71bf0d0e
|
1124 1125 |
struct disk_part_iter piter; struct hd_struct *part; |
1da177e4c
|
1126 |
char buf[BDEVNAME_SIZE]; |
1da177e4c
|
1127 |
/* Don't show non-partitionable removeable devices or empty devices */ |
d27769ec3
|
1128 |
if (!get_capacity(sgp) || (!disk_max_parts(sgp) && |
f331c0296
|
1129 |
(sgp->flags & GENHD_FL_REMOVABLE))) |
1da177e4c
|
1130 1131 1132 1133 1134 |
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
|
1135 |
disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
e71bf0d0e
|
1136 |
while ((part = disk_part_iter_next(&piter))) |
1f0142905
|
1137 1138 |
seq_printf(seqf, "%4d %7d %10llu %s ", |
f331c0296
|
1139 |
MAJOR(part_devt(part)), MINOR(part_devt(part)), |
c83f6bf98
|
1140 |
(unsigned long long)part_nr_sects_read(part) >> 1, |
f331c0296
|
1141 |
disk_name(sgp, part->partno, buf)); |
e71bf0d0e
|
1142 |
disk_part_iter_exit(&piter); |
1da177e4c
|
1143 1144 1145 |
return 0; } |
f500975a3
|
1146 |
static const struct seq_operations partitions_op = { |
def4e38dd
|
1147 1148 1149 |
.start = show_partition_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
edfaa7c36
|
1150 |
.show = show_partition |
1da177e4c
|
1151 1152 |
}; #endif |
cf771cb5a
|
1153 |
static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
1da177e4c
|
1154 |
{ |
edfaa7c36
|
1155 |
if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
1da177e4c
|
1156 |
/* Make old-style 2.4 aliases work */ |
edfaa7c36
|
1157 |
request_module("block-major-%d", MAJOR(devt)); |
1da177e4c
|
1158 1159 1160 1161 1162 |
return NULL; } static int __init genhd_device_init(void) { |
e105b8bfc
|
1163 1164 1165 1166 |
int error; block_class.dev_kobj = sysfs_dev_block_kobj; error = class_register(&block_class); |
ee27a558a
|
1167 1168 |
if (unlikely(error)) return error; |
edfaa7c36
|
1169 |
bdev_map = kobj_map_init(base_probe, &block_class_lock); |
1da177e4c
|
1170 |
blk_dev_init(); |
edfaa7c36
|
1171 |
|
561ec68e4
|
1172 |
register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
edfaa7c36
|
1173 |
/* create top-level block dir */ |
e52eec13c
|
1174 1175 |
if (!sysfs_deprecated) block_depr = kobject_create_and_add("block", NULL); |
830d3cfb1
|
1176 |
return 0; |
1da177e4c
|
1177 1178 1179 |
} subsys_initcall(genhd_device_init); |
edfaa7c36
|
1180 1181 |
static ssize_t disk_range_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4c
|
1182 |
{ |
edfaa7c36
|
1183 |
struct gendisk *disk = dev_to_disk(dev); |
1da177e4c
|
1184 |
|
edfaa7c36
|
1185 1186 |
return sprintf(buf, "%d ", disk->minors); |
1da177e4c
|
1187 |
} |
1f0142905
|
1188 1189 1190 1191 |
static ssize_t disk_ext_range_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
b5d0b9df0
|
1192 1193 |
return sprintf(buf, "%d ", disk_max_parts(disk)); |
1f0142905
|
1194 |
} |
edfaa7c36
|
1195 1196 |
static ssize_t disk_removable_show(struct device *dev, struct device_attribute *attr, char *buf) |
a7fd67062
|
1197 |
{ |
edfaa7c36
|
1198 |
struct gendisk *disk = dev_to_disk(dev); |
a7fd67062
|
1199 |
|
edfaa7c36
|
1200 1201 1202 |
return sprintf(buf, "%d ", (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); |
a7fd67062
|
1203 |
} |
8ddcd6532
|
1204 1205 1206 1207 1208 1209 1210 1211 1212 |
static ssize_t disk_hidden_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); return sprintf(buf, "%d ", (disk->flags & GENHD_FL_HIDDEN ? 1 : 0)); } |
1c9ce5276
|
1213 1214 1215 1216 |
static ssize_t disk_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
b7db9956e
|
1217 1218 |
return sprintf(buf, "%d ", get_disk_ro(disk) ? 1 : 0); |
1c9ce5276
|
1219 |
} |
3ad5cee5c
|
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 |
ssize_t part_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); return sprintf(buf, "%llu ", (unsigned long long)part_nr_sects_read(p)); } ssize_t part_stat_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); struct request_queue *q = part_to_disk(p)->queue; |
ea18e0f0a
|
1235 |
struct disk_stats stat; |
3ad5cee5c
|
1236 |
unsigned int inflight; |
ea18e0f0a
|
1237 |
part_stat_read_all(p, &stat); |
b2f609e19
|
1238 1239 1240 |
if (queue_is_mq(q)) inflight = blk_mq_in_flight(q, p); else |
1f06959bd
|
1241 |
inflight = part_in_flight(p); |
ea18e0f0a
|
1242 |
|
3ad5cee5c
|
1243 1244 1245 1246 1247 1248 1249 1250 |
return sprintf(buf, "%8lu %8lu %8llu %8u " "%8lu %8lu %8llu %8u " "%8u %8u %8u " "%8lu %8lu %8llu %8u " "%8lu %8u" " ", |
ea18e0f0a
|
1251 1252 1253 1254 1255 1256 1257 1258 |
stat.ios[STAT_READ], stat.merges[STAT_READ], (unsigned long long)stat.sectors[STAT_READ], (unsigned int)div_u64(stat.nsecs[STAT_READ], NSEC_PER_MSEC), stat.ios[STAT_WRITE], stat.merges[STAT_WRITE], (unsigned long long)stat.sectors[STAT_WRITE], (unsigned int)div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC), |
3ad5cee5c
|
1259 |
inflight, |
ea18e0f0a
|
1260 |
jiffies_to_msecs(stat.io_ticks), |
8cd5b8fc0
|
1261 1262 1263 1264 1265 |
(unsigned int)div_u64(stat.nsecs[STAT_READ] + stat.nsecs[STAT_WRITE] + stat.nsecs[STAT_DISCARD] + stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC), |
ea18e0f0a
|
1266 1267 1268 1269 1270 1271 |
stat.ios[STAT_DISCARD], stat.merges[STAT_DISCARD], (unsigned long long)stat.sectors[STAT_DISCARD], (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], NSEC_PER_MSEC), stat.ios[STAT_FLUSH], (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC)); |
3ad5cee5c
|
1272 1273 1274 1275 1276 1277 1278 1279 |
} ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); struct request_queue *q = part_to_disk(p)->queue; unsigned int inflight[2]; |
b2f609e19
|
1280 1281 1282 |
if (queue_is_mq(q)) blk_mq_in_flight_rw(q, p, inflight); else |
1f06959bd
|
1283 |
part_in_flight_rw(p, inflight); |
b2f609e19
|
1284 |
|
3ad5cee5c
|
1285 1286 1287 |
return sprintf(buf, "%8u %8u ", inflight[0], inflight[1]); } |
edfaa7c36
|
1288 1289 |
static ssize_t disk_capability_show(struct device *dev, struct device_attribute *attr, char *buf) |
86ce18d7b
|
1290 |
{ |
edfaa7c36
|
1291 1292 1293 1294 |
struct gendisk *disk = dev_to_disk(dev); return sprintf(buf, "%x ", disk->flags); |
86ce18d7b
|
1295 |
} |
edfaa7c36
|
1296 |
|
c72758f33
|
1297 1298 1299 1300 1301 1302 1303 1304 1305 |
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
|
1306 1307 1308 1309 1310 |
static ssize_t disk_discard_alignment_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
dd3d145d4
|
1311 1312 |
return sprintf(buf, "%d ", queue_discard_alignment(disk->queue)); |
86b372814
|
1313 |
} |
5657a819a
|
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 |
static DEVICE_ATTR(range, 0444, disk_range_show, NULL); static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); static DEVICE_ATTR(hidden, 0444, disk_hidden_show, NULL); static DEVICE_ATTR(ro, 0444, disk_ro_show, NULL); static DEVICE_ATTR(size, 0444, part_size_show, NULL); static DEVICE_ATTR(alignment_offset, 0444, disk_alignment_offset_show, NULL); static DEVICE_ATTR(discard_alignment, 0444, disk_discard_alignment_show, NULL); static DEVICE_ATTR(capability, 0444, disk_capability_show, NULL); static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); |
3ad5cee5c
|
1326 |
|
c17bb4951
|
1327 |
#ifdef CONFIG_FAIL_MAKE_REQUEST |
3ad5cee5c
|
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 |
ssize_t part_fail_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); return sprintf(buf, "%d ", p->make_it_fail); } ssize_t part_fail_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct hd_struct *p = dev_to_part(dev); int i; if (count > 0 && sscanf(buf, "%d", &i) > 0) p->make_it_fail = (i == 0) ? 0 : 1; return count; } |
edfaa7c36
|
1349 |
static struct device_attribute dev_attr_fail = |
5657a819a
|
1350 |
__ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
3ad5cee5c
|
1351 |
#endif /* CONFIG_FAIL_MAKE_REQUEST */ |
581d4e28d
|
1352 1353 |
#ifdef CONFIG_FAIL_IO_TIMEOUT static struct device_attribute dev_attr_fail_timeout = |
5657a819a
|
1354 |
__ATTR(io-timeout-fail, 0644, part_timeout_show, part_timeout_store); |
581d4e28d
|
1355 |
#endif |
edfaa7c36
|
1356 1357 1358 |
static struct attribute *disk_attrs[] = { &dev_attr_range.attr, |
1f0142905
|
1359 |
&dev_attr_ext_range.attr, |
edfaa7c36
|
1360 |
&dev_attr_removable.attr, |
8ddcd6532
|
1361 |
&dev_attr_hidden.attr, |
1c9ce5276
|
1362 |
&dev_attr_ro.attr, |
edfaa7c36
|
1363 |
&dev_attr_size.attr, |
c72758f33
|
1364 |
&dev_attr_alignment_offset.attr, |
86b372814
|
1365 |
&dev_attr_discard_alignment.attr, |
edfaa7c36
|
1366 1367 |
&dev_attr_capability.attr, &dev_attr_stat.attr, |
316d315bf
|
1368 |
&dev_attr_inflight.attr, |
99e6608c9
|
1369 |
&dev_attr_badblocks.attr, |
edfaa7c36
|
1370 1371 1372 |
#ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif |
581d4e28d
|
1373 1374 1375 |
#ifdef CONFIG_FAIL_IO_TIMEOUT &dev_attr_fail_timeout.attr, #endif |
edfaa7c36
|
1376 1377 |
NULL }; |
9438b3e08
|
1378 1379 1380 1381 1382 1383 1384 1385 1386 |
static umode_t disk_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, typeof(*dev), kobj); struct gendisk *disk = dev_to_disk(dev); if (a == &dev_attr_badblocks.attr && !disk->bb) return 0; return a->mode; } |
edfaa7c36
|
1387 1388 |
static struct attribute_group disk_attr_group = { .attrs = disk_attrs, |
9438b3e08
|
1389 |
.is_visible = disk_visible, |
edfaa7c36
|
1390 |
}; |
a4dbd6740
|
1391 |
static const struct attribute_group *disk_attr_groups[] = { |
edfaa7c36
|
1392 1393 |
&disk_attr_group, NULL |
1da177e4c
|
1394 |
}; |
540eed563
|
1395 1396 1397 1398 1399 1400 1401 1402 1403 |
/** * 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: |
6d2cf6f2b
|
1404 |
* Matching bd_mutex locked or the caller is the only user of @disk. |
540eed563
|
1405 1406 1407 1408 |
*/ static void disk_replace_part_tbl(struct gendisk *disk, struct disk_part_tbl *new_ptbl) { |
6d2cf6f2b
|
1409 1410 |
struct disk_part_tbl *old_ptbl = rcu_dereference_protected(disk->part_tbl, 1); |
540eed563
|
1411 1412 |
rcu_assign_pointer(disk->part_tbl, new_ptbl); |
a6f23657d
|
1413 1414 1415 |
if (old_ptbl) { rcu_assign_pointer(old_ptbl->last_lookup, NULL); |
57bdfbf9e
|
1416 |
kfree_rcu(old_ptbl, rcu_head); |
a6f23657d
|
1417 |
} |
540eed563
|
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 |
} /** * 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: |
6d2cf6f2b
|
1429 1430 |
* Matching bd_mutex locked or the caller is the only user of @disk. * Might sleep. |
540eed563
|
1431 1432 1433 1434 1435 1436 |
* * RETURNS: * 0 on success, -errno on failure. */ int disk_expand_part_tbl(struct gendisk *disk, int partno) { |
6d2cf6f2b
|
1437 1438 |
struct disk_part_tbl *old_ptbl = rcu_dereference_protected(disk->part_tbl, 1); |
540eed563
|
1439 1440 |
struct disk_part_tbl *new_ptbl; int len = old_ptbl ? old_ptbl->len : 0; |
5fabcb4c3
|
1441 |
int i, target; |
5fabcb4c3
|
1442 1443 1444 1445 1446 1447 1448 1449 |
/* * 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
|
1450 1451 1452 1453 1454 1455 1456 |
/* 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; |
78b90a2ce
|
1457 1458 |
new_ptbl = kzalloc_node(struct_size(new_ptbl, part, target), GFP_KERNEL, disk->node_id); |
540eed563
|
1459 1460 |
if (!new_ptbl) return -ENOMEM; |
540eed563
|
1461 1462 1463 1464 1465 1466 1467 1468 |
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; } |
b5bd357cf
|
1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 |
/** * disk_release - releases all allocated resources of the gendisk * @dev: the device representing this disk * * This function releases all allocated resources of the gendisk. * * The struct gendisk refcount is incremented with get_gendisk() or * get_disk_and_module(), and its refcount is decremented with * put_disk_and_module() or put_disk(). Once the refcount reaches 0 this * function is called. * * Drivers which used __device_add_disk() have a gendisk with a request_queue * assigned. Since the request_queue sits on top of the gendisk for these * drivers we also call blk_put_queue() for them, and we expect the * request_queue refcount to reach 0 at this point, and so the request_queue * will also be freed prior to the disk. |
e8c7d14ac
|
1485 1486 |
* * Context: can sleep |
b5bd357cf
|
1487 |
*/ |
edfaa7c36
|
1488 |
static void disk_release(struct device *dev) |
1da177e4c
|
1489 |
{ |
edfaa7c36
|
1490 |
struct gendisk *disk = dev_to_disk(dev); |
e8c7d14ac
|
1491 |
might_sleep(); |
2da78092d
|
1492 |
blk_free_devt(dev->devt); |
77ea887e4
|
1493 |
disk_release_events(disk); |
1da177e4c
|
1494 |
kfree(disk->random); |
540eed563
|
1495 |
disk_replace_part_tbl(disk, NULL); |
b54e5ed8f
|
1496 |
hd_free_part(&disk->part0); |
523e1d399
|
1497 1498 |
if (disk->queue) blk_put_queue(disk->queue); |
1da177e4c
|
1499 1500 |
kfree(disk); } |
edfaa7c36
|
1501 1502 |
struct class block_class = { .name = "block", |
1da177e4c
|
1503 |
}; |
3c2670e65
|
1504 |
static char *block_devnode(struct device *dev, umode_t *mode, |
4e4098a3e
|
1505 |
kuid_t *uid, kgid_t *gid) |
b03f38b68
|
1506 1507 |
{ struct gendisk *disk = dev_to_disk(dev); |
348e114bb
|
1508 1509 |
if (disk->fops->devnode) return disk->fops->devnode(disk, mode); |
b03f38b68
|
1510 1511 |
return NULL; } |
ef45fe470
|
1512 |
const struct device_type disk_type = { |
edfaa7c36
|
1513 1514 1515 |
.name = "disk", .groups = disk_attr_groups, .release = disk_release, |
e454cea20
|
1516 |
.devnode = block_devnode, |
1da177e4c
|
1517 |
}; |
a6e2ba887
|
1518 |
#ifdef CONFIG_PROC_FS |
cf771cb5a
|
1519 1520 1521 1522 1523 1524 1525 1526 |
/* * 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
|
1527 1528 |
{ struct gendisk *gp = v; |
e71bf0d0e
|
1529 1530 |
struct disk_part_iter piter; struct hd_struct *hd; |
1da177e4c
|
1531 |
char buf[BDEVNAME_SIZE]; |
e016b7820
|
1532 |
unsigned int inflight; |
ea18e0f0a
|
1533 |
struct disk_stats stat; |
1da177e4c
|
1534 1535 |
/* |
ed9e19823
|
1536 |
if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
cf771cb5a
|
1537 |
seq_puts(seqf, "major minor name" |
1da177e4c
|
1538 1539 1540 1541 1542 1543 |
" rio rmerge rsect ruse wio wmerge " "wsect wuse running use aveq" " "); */ |
9f5e48655
|
1544 |
|
71982a409
|
1545 |
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
e71bf0d0e
|
1546 |
while ((hd = disk_part_iter_next(&piter))) { |
ea18e0f0a
|
1547 |
part_stat_read_all(hd, &stat); |
b2f609e19
|
1548 1549 1550 |
if (queue_is_mq(gp->queue)) inflight = blk_mq_in_flight(gp->queue, hd); else |
1f06959bd
|
1551 |
inflight = part_in_flight(hd); |
ea18e0f0a
|
1552 |
|
bdca3c87f
|
1553 1554 1555 1556 |
seq_printf(seqf, "%4d %7d %s " "%lu %lu %lu %u " "%lu %lu %lu %u " "%u %u %u " |
b68663186
|
1557 1558 1559 1560 |
"%lu %lu %lu %u " "%lu %u" " ", |
f331c0296
|
1561 1562 |
MAJOR(part_devt(hd)), MINOR(part_devt(hd)), disk_name(gp, hd->partno, buf), |
ea18e0f0a
|
1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 |
stat.ios[STAT_READ], stat.merges[STAT_READ], stat.sectors[STAT_READ], (unsigned int)div_u64(stat.nsecs[STAT_READ], NSEC_PER_MSEC), stat.ios[STAT_WRITE], stat.merges[STAT_WRITE], stat.sectors[STAT_WRITE], (unsigned int)div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC), |
e016b7820
|
1573 |
inflight, |
ea18e0f0a
|
1574 |
jiffies_to_msecs(stat.io_ticks), |
8cd5b8fc0
|
1575 1576 1577 1578 1579 |
(unsigned int)div_u64(stat.nsecs[STAT_READ] + stat.nsecs[STAT_WRITE] + stat.nsecs[STAT_DISCARD] + stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC), |
ea18e0f0a
|
1580 1581 1582 1583 1584 1585 1586 1587 |
stat.ios[STAT_DISCARD], stat.merges[STAT_DISCARD], stat.sectors[STAT_DISCARD], (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], NSEC_PER_MSEC), stat.ios[STAT_FLUSH], (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC) |
28f39d553
|
1588 |
); |
1da177e4c
|
1589 |
} |
e71bf0d0e
|
1590 |
disk_part_iter_exit(&piter); |
9f5e48655
|
1591 |
|
1da177e4c
|
1592 1593 |
return 0; } |
31d85ab28
|
1594 |
static const struct seq_operations diskstats_op = { |
def4e38dd
|
1595 1596 1597 |
.start = disk_seqf_start, .next = disk_seqf_next, .stop = disk_seqf_stop, |
1da177e4c
|
1598 1599 |
.show = diskstats_show }; |
f500975a3
|
1600 1601 1602 |
static int __init proc_genhd_init(void) { |
fddda2b7b
|
1603 1604 |
proc_create_seq("diskstats", 0, NULL, &diskstats_op); proc_create_seq("partitions", 0, NULL, &partitions_op); |
f500975a3
|
1605 1606 1607 |
return 0; } module_init(proc_genhd_init); |
a6e2ba887
|
1608 |
#endif /* CONFIG_PROC_FS */ |
1da177e4c
|
1609 |
|
cf771cb5a
|
1610 |
dev_t blk_lookup_devt(const char *name, int partno) |
a142be856
|
1611 |
{ |
def4e38dd
|
1612 1613 1614 |
dev_t devt = MKDEV(0, 0); struct class_dev_iter iter; struct device *dev; |
a142be856
|
1615 |
|
def4e38dd
|
1616 1617 |
class_dev_iter_init(&iter, &block_class, NULL, &disk_type); while ((dev = class_dev_iter_next(&iter))) { |
a142be856
|
1618 |
struct gendisk *disk = dev_to_disk(dev); |
548b10eb2
|
1619 |
struct hd_struct *part; |
a142be856
|
1620 |
|
3ada8b7e9
|
1621 |
if (strcmp(dev_name(dev), name)) |
f331c0296
|
1622 |
continue; |
f331c0296
|
1623 |
|
41b8c853a
|
1624 1625 1626 1627 1628 1629 1630 1631 |
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
|
1632 |
part = disk_get_part(disk, partno); |
2bbedcb4c
|
1633 |
if (part) { |
f331c0296
|
1634 |
devt = part_devt(part); |
e71bf0d0e
|
1635 |
disk_put_part(part); |
548b10eb2
|
1636 |
break; |
def4e38dd
|
1637 |
} |
548b10eb2
|
1638 |
disk_put_part(part); |
5c0ef6d02
|
1639 |
} |
def4e38dd
|
1640 |
class_dev_iter_exit(&iter); |
edfaa7c36
|
1641 1642 |
return devt; } |
edfaa7c36
|
1643 |
|
e319e1fbd
|
1644 |
struct gendisk *__alloc_disk_node(int minors, int node_id) |
1946089a1
|
1645 1646 |
{ struct gendisk *disk; |
6d2cf6f2b
|
1647 |
struct disk_part_tbl *ptbl; |
1946089a1
|
1648 |
|
de65b0123
|
1649 1650 |
if (minors > DISK_MAX_PARTS) { printk(KERN_ERR |
7fb526212
|
1651 1652 |
"block: can't allocate more than %d partitions ", |
de65b0123
|
1653 1654 1655 |
DISK_MAX_PARTS); minors = DISK_MAX_PARTS; } |
1946089a1
|
1656 |
|
c1b511eb2
|
1657 |
disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); |
f93af2a49
|
1658 1659 |
if (!disk) return NULL; |
6c23a9681
|
1660 |
|
f93af2a49
|
1661 1662 1663 |
disk->part0.dkstats = alloc_percpu(struct disk_stats); if (!disk->part0.dkstats) goto out_free_disk; |
b5d0b9df0
|
1664 |
|
f93af2a49
|
1665 1666 1667 1668 1669 |
init_rwsem(&disk->lookup_sem); disk->node_id = node_id; if (disk_expand_part_tbl(disk, 0)) { free_percpu(disk->part0.dkstats); goto out_free_disk; |
1da177e4c
|
1670 |
} |
f93af2a49
|
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 |
ptbl = rcu_dereference_protected(disk->part_tbl, 1); rcu_assign_pointer(ptbl->part[0], &disk->part0); /* * set_capacity() and get_capacity() currently don't use * seqcounter to read/update the part0->nr_sects. Still init * the counter as we can read the sectors in IO submission * patch using seqence counters. * * TODO: Ideally set_capacity() and get_capacity() should be * converted to make use of bd_mutex and sequence counters. */ hd_sects_seq_init(&disk->part0); if (hd_ref_init(&disk->part0)) goto out_free_part0; disk->minors = minors; rand_initialize_disk(disk); disk_to_dev(disk)->class = &block_class; disk_to_dev(disk)->type = &disk_type; device_initialize(disk_to_dev(disk)); |
1da177e4c
|
1693 |
return disk; |
f93af2a49
|
1694 1695 1696 1697 1698 1699 |
out_free_part0: hd_free_part(&disk->part0); out_free_disk: kfree(disk); return NULL; |
1da177e4c
|
1700 |
} |
e319e1fbd
|
1701 |
EXPORT_SYMBOL(__alloc_disk_node); |
1da177e4c
|
1702 |
|
b5bd357cf
|
1703 1704 |
/** * get_disk_and_module - increments the gendisk and gendisk fops module refcount |
0d20dcc27
|
1705 |
* @disk: the struct gendisk to increment the refcount for |
b5bd357cf
|
1706 1707 1708 |
* * This increments the refcount for the struct gendisk, and the gendisk's * fops module owner. |
763b58923
|
1709 1710 |
* * Context: Any context. |
b5bd357cf
|
1711 |
*/ |
3079c22ea
|
1712 |
struct kobject *get_disk_and_module(struct gendisk *disk) |
1da177e4c
|
1713 1714 1715 1716 1717 1718 1719 1720 1721 |
{ struct module *owner; struct kobject *kobj; if (!disk->fops) return NULL; owner = disk->fops->owner; if (owner && !try_module_get(owner)) return NULL; |
d01b2dcb4
|
1722 |
kobj = kobject_get_unless_zero(&disk_to_dev(disk)->kobj); |
1da177e4c
|
1723 1724 1725 1726 1727 1728 1729 |
if (kobj == NULL) { module_put(owner); return NULL; } return kobj; } |
3079c22ea
|
1730 |
EXPORT_SYMBOL(get_disk_and_module); |
1da177e4c
|
1731 |
|
b5bd357cf
|
1732 1733 |
/** * put_disk - decrements the gendisk refcount |
0d20dcc27
|
1734 |
* @disk: the struct gendisk to decrement the refcount for |
b5bd357cf
|
1735 1736 1737 |
* * This decrements the refcount for the struct gendisk. When this reaches 0 * we'll have disk_release() called. |
e8c7d14ac
|
1738 1739 1740 |
* * Context: Any context, but the last reference must not be dropped from * atomic context. |
b5bd357cf
|
1741 |
*/ |
1da177e4c
|
1742 1743 1744 |
void put_disk(struct gendisk *disk) { if (disk) |
ed9e19823
|
1745 |
kobject_put(&disk_to_dev(disk)->kobj); |
1da177e4c
|
1746 |
} |
1da177e4c
|
1747 |
EXPORT_SYMBOL(put_disk); |
b5bd357cf
|
1748 1749 |
/** * put_disk_and_module - decrements the module and gendisk refcount |
0d20dcc27
|
1750 |
* @disk: the struct gendisk to decrement the refcount for |
b5bd357cf
|
1751 |
* |
9df6c2991
|
1752 1753 |
* This is a counterpart of get_disk_and_module() and thus also of * get_gendisk(). |
e8c7d14ac
|
1754 1755 1756 |
* * Context: Any context, but the last reference must not be dropped from * atomic context. |
9df6c2991
|
1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 |
*/ void put_disk_and_module(struct gendisk *disk) { if (disk) { struct module *owner = disk->fops->owner; put_disk(disk); module_put(owner); } } EXPORT_SYMBOL(put_disk_and_module); |
e3264a4d7
|
1768 1769 1770 1771 1772 1773 1774 1775 1776 |
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
|
1777 1778 |
void set_device_ro(struct block_device *bdev, int flag) { |
b7db9956e
|
1779 |
bdev->bd_part->policy = flag; |
1da177e4c
|
1780 1781 1782 1783 1784 1785 |
} EXPORT_SYMBOL(set_device_ro); void set_disk_ro(struct gendisk *disk, int flag) { |
e71bf0d0e
|
1786 1787 |
struct disk_part_iter piter; struct hd_struct *part; |
e3264a4d7
|
1788 1789 1790 1791 1792 1793 |
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
|
1794 1795 1796 |
while ((part = disk_part_iter_next(&piter))) part->policy = flag; disk_part_iter_exit(&piter); |
1da177e4c
|
1797 1798 1799 1800 1801 1802 1803 1804 |
} EXPORT_SYMBOL(set_disk_ro); int bdev_read_only(struct block_device *bdev) { if (!bdev) return 0; |
b7db9956e
|
1805 |
return bdev->bd_part->policy; |
1da177e4c
|
1806 1807 1808 |
} EXPORT_SYMBOL(bdev_read_only); |
77ea887e4
|
1809 1810 1811 1812 1813 1814 1815 |
/* * 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
|
1816 |
struct mutex block_mutex; /* protects blocking */ |
77ea887e4
|
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 |
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 */ |
1fe8f3484
|
1840 |
static unsigned long disk_events_dfl_poll_msecs; |
77ea887e4
|
1841 1842 1843 1844 1845 1846 1847 1848 |
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 |
673387a93
|
1849 |
* the default is being used, poll if the POLL flag is set. |
77ea887e4
|
1850 1851 1852 |
*/ if (ev->poll_msecs >= 0) intv_msecs = ev->poll_msecs; |
c92e2f04b
|
1853 |
else if (disk->event_flags & DISK_EVENT_FLAG_POLL) |
77ea887e4
|
1854 1855 1856 1857 |
intv_msecs = disk_events_dfl_poll_msecs; return msecs_to_jiffies(intv_msecs); } |
c3af54afb
|
1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 |
/** * disk_block_events - block and flush disk event checking * @disk: disk to block events for * * On return from this function, it is guaranteed that event checking * isn't in progress and won't happen until unblocked by * disk_unblock_events(). Events blocking is counted and the actual * unblocking happens after the matching number of unblocks are done. * * Note that this intentionally does not block event checking from * disk_clear_events(). * * CONTEXT: * Might sleep. */ void disk_block_events(struct gendisk *disk) |
77ea887e4
|
1874 1875 1876 1877 |
{ struct disk_events *ev = disk->ev; unsigned long flags; bool cancel; |
c3af54afb
|
1878 1879 |
if (!ev) return; |
fdd514e16
|
1880 1881 1882 1883 1884 |
/* * Outer mutex ensures that the first blocker completes canceling * the event work before further blockers are allowed to finish. */ mutex_lock(&ev->block_mutex); |
77ea887e4
|
1885 1886 1887 |
spin_lock_irqsave(&ev->lock, flags); cancel = !ev->block++; spin_unlock_irqrestore(&ev->lock, flags); |
c3af54afb
|
1888 1889 |
if (cancel) cancel_delayed_work_sync(&disk->ev->dwork); |
fdd514e16
|
1890 1891 |
mutex_unlock(&ev->block_mutex); |
77ea887e4
|
1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 |
} 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; |
77ea887e4
|
1907 |
intv = disk_events_poll_jiffies(disk); |
77ea887e4
|
1908 |
if (check_now) |
695588f94
|
1909 1910 |
queue_delayed_work(system_freezable_power_efficient_wq, &ev->dwork, 0); |
77ea887e4
|
1911 |
else if (intv) |
695588f94
|
1912 1913 |
queue_delayed_work(system_freezable_power_efficient_wq, &ev->dwork, intv); |
77ea887e4
|
1914 1915 1916 1917 1918 |
out_unlock: spin_unlock_irqrestore(&ev->lock, flags); } /** |
77ea887e4
|
1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 |
* disk_unblock_events - unblock disk event checking * @disk: disk to unblock events for * * Undo disk_block_events(). When the block count reaches zero, it * starts events polling if configured. * * CONTEXT: * Don't care. Safe to call from irq context. */ void disk_unblock_events(struct gendisk *disk) { if (disk->ev) |
facc31ddc
|
1931 |
__disk_unblock_events(disk, false); |
77ea887e4
|
1932 1933 1934 |
} /** |
85ef06d1d
|
1935 1936 1937 |
* disk_flush_events - schedule immediate event checking and flushing * @disk: disk to check and flush events for * @mask: events to flush |
77ea887e4
|
1938 |
* |
85ef06d1d
|
1939 1940 1941 |
* Schedule immediate event checking on @disk if not blocked. Events in * @mask are scheduled to be cleared from the driver. Note that this * doesn't clear the events from @disk->ev. |
77ea887e4
|
1942 1943 |
* * CONTEXT: |
85ef06d1d
|
1944 |
* If @mask is non-zero must be called with bdev->bd_mutex held. |
77ea887e4
|
1945 |
*/ |
85ef06d1d
|
1946 |
void disk_flush_events(struct gendisk *disk, unsigned int mask) |
77ea887e4
|
1947 |
{ |
a9dce2a3b
|
1948 |
struct disk_events *ev = disk->ev; |
a9dce2a3b
|
1949 1950 1951 |
if (!ev) return; |
85ef06d1d
|
1952 1953 |
spin_lock_irq(&ev->lock); ev->clearing |= mask; |
41f63c535
|
1954 |
if (!ev->block) |
695588f94
|
1955 1956 |
mod_delayed_work(system_freezable_power_efficient_wq, &ev->dwork, 0); |
85ef06d1d
|
1957 |
spin_unlock_irq(&ev->lock); |
77ea887e4
|
1958 |
} |
77ea887e4
|
1959 1960 1961 1962 |
/** * disk_clear_events - synchronously check, clear and return pending events * @disk: disk to fetch and clear events from |
da3dae54e
|
1963 |
* @mask: mask of events to be fetched and cleared |
77ea887e4
|
1964 1965 1966 1967 1968 1969 1970 |
* * Disk events are synchronously checked and pending events in @mask * are cleared and returned. This ignores the block count. * * CONTEXT: * Might sleep. */ |
95f6f3a46
|
1971 |
static unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask) |
77ea887e4
|
1972 |
{ |
77ea887e4
|
1973 1974 |
struct disk_events *ev = disk->ev; unsigned int pending; |
12c2bdb23
|
1975 |
unsigned int clearing = mask; |
77ea887e4
|
1976 |
|
a564e23f0
|
1977 |
if (!ev) |
77ea887e4
|
1978 |
return 0; |
77ea887e4
|
1979 |
|
12c2bdb23
|
1980 1981 1982 1983 1984 1985 1986 |
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). */ |
77ea887e4
|
1987 |
spin_lock_irq(&ev->lock); |
12c2bdb23
|
1988 1989 |
clearing |= ev->clearing; ev->clearing = 0; |
77ea887e4
|
1990 |
spin_unlock_irq(&ev->lock); |
12c2bdb23
|
1991 |
disk_check_events(ev, &clearing); |
aea24a8bb
|
1992 |
/* |
12c2bdb23
|
1993 1994 |
* 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. |
aea24a8bb
|
1995 |
*/ |
12c2bdb23
|
1996 |
__disk_unblock_events(disk, ev->clearing ? true : false); |
77ea887e4
|
1997 1998 1999 |
/* then, fetch and clear pending events */ spin_lock_irq(&ev->lock); |
77ea887e4
|
2000 2001 2002 |
pending = ev->pending & mask; ev->pending &= ~mask; spin_unlock_irq(&ev->lock); |
12c2bdb23
|
2003 |
WARN_ON_ONCE(clearing & mask); |
77ea887e4
|
2004 2005 2006 |
return pending; } |
95f6f3a46
|
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 |
/** * bdev_check_media_change - check if a removable media has been changed * @bdev: block device to check * * Check whether a removable media has been changed, and attempt to free all * dentries and inodes and invalidates all block device page cache entries in * that case. * * Returns %true if the block device changed, or %false if not. */ bool bdev_check_media_change(struct block_device *bdev) { unsigned int events; events = disk_clear_events(bdev->bd_disk, DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST); if (!(events & DISK_EVENT_MEDIA_CHANGE)) return false; if (__invalidate_device(bdev, true)) pr_warn("VFS: busy inodes on changed media %s ", bdev->bd_disk->disk_name); |
38430f087
|
2030 |
set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state); |
95f6f3a46
|
2031 2032 2033 |
return true; } EXPORT_SYMBOL(bdev_check_media_change); |
12c2bdb23
|
2034 2035 2036 2037 |
/* * Separate this part out so that a different pointer for clearing_ptr can be * passed in for disk_clear_events. */ |
77ea887e4
|
2038 2039 2040 2041 |
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); |
12c2bdb23
|
2042 2043 2044 2045 2046 2047 2048 |
disk_check_events(ev, &ev->clearing); } static void disk_check_events(struct disk_events *ev, unsigned int *clearing_ptr) { |
77ea887e4
|
2049 2050 |
struct gendisk *disk = ev->disk; char *envp[ARRAY_SIZE(disk_uevents) + 1] = { }; |
12c2bdb23
|
2051 |
unsigned int clearing = *clearing_ptr; |
77ea887e4
|
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 |
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; |
12c2bdb23
|
2064 |
*clearing_ptr &= ~clearing; |
77ea887e4
|
2065 2066 2067 |
intv = disk_events_poll_jiffies(disk); if (!ev->block && intv) |
695588f94
|
2068 2069 |
queue_delayed_work(system_freezable_power_efficient_wq, &ev->dwork, intv); |
77ea887e4
|
2070 2071 |
spin_unlock_irq(&ev->lock); |
7c88a168d
|
2072 2073 |
/* * Tell userland about new events. Only the events listed in |
c92e2f04b
|
2074 2075 2076 |
* @disk->events are reported, and only if DISK_EVENT_FLAG_UEVENT * is set. Otherwise, events are processed internally but never * get reported to userland. |
7c88a168d
|
2077 |
*/ |
77ea887e4
|
2078 |
for (i = 0; i < ARRAY_SIZE(disk_uevents); i++) |
c92e2f04b
|
2079 2080 |
if ((events & disk->events & (1 << i)) && (disk->event_flags & DISK_EVENT_FLAG_UEVENT)) |
77ea887e4
|
2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 |
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 |
673387a93
|
2093 |
* (always empty, only for backwards compatibility) |
77ea887e4
|
2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 |
* 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); |
c92e2f04b
|
2118 2119 |
if (!(disk->event_flags & DISK_EVENT_FLAG_UEVENT)) return 0; |
77ea887e4
|
2120 2121 2122 2123 2124 2125 |
return __disk_events_show(disk->events, buf); } static ssize_t disk_events_async_show(struct device *dev, struct device_attribute *attr, char *buf) { |
673387a93
|
2126 |
return 0; |
77ea887e4
|
2127 2128 2129 2130 2131 2132 2133 |
} static ssize_t disk_events_poll_msecs_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); |
cdf3e3deb
|
2134 2135 2136 |
if (!disk->ev) return sprintf(buf, "-1 "); |
77ea887e4
|
2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 |
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; |
cdf3e3deb
|
2153 2154 |
if (!disk->ev) return -ENODEV; |
c3af54afb
|
2155 |
disk_block_events(disk); |
77ea887e4
|
2156 2157 2158 2159 2160 |
disk->ev->poll_msecs = intv; __disk_unblock_events(disk, true); return count; } |
5657a819a
|
2161 2162 2163 |
static const DEVICE_ATTR(events, 0444, disk_events_show, NULL); static const DEVICE_ATTR(events_async, 0444, disk_events_async_show, NULL); static const DEVICE_ATTR(events_poll_msecs, 0644, |
77ea887e4
|
2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 |
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 |
1624b0b20
|
2178 |
* /sys/module/block/parameters/events_dfl_poll_msecs. |
77ea887e4
|
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 |
*/ static int disk_events_set_dfl_poll_msecs(const char *val, const struct kernel_param *kp) { struct disk_events *ev; int ret; ret = param_set_ulong(val, kp); if (ret < 0) return ret; mutex_lock(&disk_events_mutex); list_for_each_entry(ev, &disk_events, node) |
85ef06d1d
|
2193 |
disk_flush_events(ev->disk, 0); |
77ea887e4
|
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 |
mutex_unlock(&disk_events_mutex); return 0; } static const struct kernel_param_ops disk_events_dfl_poll_msecs_param_ops = { .set = disk_events_set_dfl_poll_msecs, .get = param_get_ulong, }; #undef MODULE_PARAM_PREFIX #define MODULE_PARAM_PREFIX "block." module_param_cb(events_dfl_poll_msecs, &disk_events_dfl_poll_msecs_param_ops, &disk_events_dfl_poll_msecs, 0644); /* |
9f53d2fe8
|
2212 |
* disk_{alloc|add|del|release}_events - initialize and destroy disk_events. |
77ea887e4
|
2213 |
*/ |
9f53d2fe8
|
2214 |
static void disk_alloc_events(struct gendisk *disk) |
77ea887e4
|
2215 2216 |
{ struct disk_events *ev; |
cdf3e3deb
|
2217 |
if (!disk->fops->check_events || !disk->events) |
77ea887e4
|
2218 2219 2220 2221 2222 2223 2224 2225 |
return; ev = kzalloc(sizeof(*ev), GFP_KERNEL); if (!ev) { pr_warn("%s: failed to initialize events ", disk->disk_name); return; } |
77ea887e4
|
2226 2227 2228 |
INIT_LIST_HEAD(&ev->node); ev->disk = disk; spin_lock_init(&ev->lock); |
fdd514e16
|
2229 |
mutex_init(&ev->block_mutex); |
77ea887e4
|
2230 2231 2232 |
ev->block = 1; ev->poll_msecs = -1; INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); |
9f53d2fe8
|
2233 2234 2235 2236 2237 |
disk->ev = ev; } static void disk_add_events(struct gendisk *disk) { |
9f53d2fe8
|
2238 2239 2240 2241 2242 |
/* 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); |
cdf3e3deb
|
2243 2244 |
if (!disk->ev) return; |
77ea887e4
|
2245 |
mutex_lock(&disk_events_mutex); |
9f53d2fe8
|
2246 |
list_add_tail(&disk->ev->node, &disk_events); |
77ea887e4
|
2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 |
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) { |
cdf3e3deb
|
2258 2259 |
if (disk->ev) { disk_block_events(disk); |
77ea887e4
|
2260 |
|
cdf3e3deb
|
2261 2262 2263 2264 |
mutex_lock(&disk_events_mutex); list_del_init(&disk->ev->node); mutex_unlock(&disk_events_mutex); } |
77ea887e4
|
2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 |
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); } |