diff options
| -rw-r--r-- | block/genhd.c | 252 |
1 files changed, 97 insertions, 155 deletions
diff --git a/block/genhd.c b/block/genhd.c index 9eb8b3e212c1..8b9a9ff1a842 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -226,117 +226,114 @@ struct gendisk *get_gendisk(dev_t devt, int *part) } /* - * print a partitions - intended for places where the root filesystem can't be - * mounted and thus to give the victim some idea of what went wrong - */ -static int printk_partition(struct device *dev, void *data) -{ - struct gendisk *sgp; - char buf[BDEVNAME_SIZE]; - int n; - - if (dev->type != &disk_type) - return 0; - - sgp = dev_to_disk(dev); - /* - * Don't show empty devices or things that have been surpressed - */ - if (get_capacity(sgp) == 0 || - (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) - return 0; - - /* - * Note, unlike /proc/partitions, I am showing the numbers in - * hex - the same format as the root= option takes. - */ - printk("%02x%02x %10llu %s", - sgp->major, sgp->first_minor, - (unsigned long long)get_capacity(sgp) >> 1, - disk_name(sgp, 0, buf)); - if (sgp->driverfs_dev != NULL && - sgp->driverfs_dev->driver != NULL) - printk(" driver: %s\n", - sgp->driverfs_dev->driver->name); - else - printk(" (driver?)\n"); - - /* now show the partitions */ - for (n = 0; n < sgp->minors - 1; ++n) { - if (sgp->part[n] == NULL) - continue; - if (sgp->part[n]->nr_sects == 0) - continue; - printk(" %02x%02x %10llu %s\n", - sgp->major, n + 1 + sgp->first_minor, - (unsigned long long)sgp->part[n]->nr_sects >> 1, - disk_name(sgp, n + 1, buf)); - } - - return 0; -} - -/* * 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) { - class_for_each_device(&block_class, NULL, NULL, printk_partition); + 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); + char buf[BDEVNAME_SIZE]; + int n; + + /* + * 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. + */ + printk("%02x%02x %10llu %s", + disk->major, disk->first_minor, + (unsigned long long)get_capacity(disk) >> 1, + disk_name(disk, 0, buf)); + if (disk->driverfs_dev != NULL && + disk->driverfs_dev->driver != NULL) + printk(" driver: %s\n", + disk->driverfs_dev->driver->name); + else + printk(" (driver?)\n"); + + /* now show the partitions */ + for (n = 0; n < disk->minors - 1; ++n) { + if (disk->part[n] == NULL) + continue; + if (disk->part[n]->nr_sects == 0) + continue; + printk(" %02x%02x %10llu %s\n", + disk->major, n + 1 + disk->first_minor, + (unsigned long long)disk->part[n]->nr_sects >> 1, + disk_name(disk, n + 1, buf)); + } + } + class_dev_iter_exit(&iter); } #ifdef CONFIG_PROC_FS /* iterator */ -static int find_start(struct device *dev, void *data) +static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) { - loff_t *k = data; + loff_t skip = *pos; + struct class_dev_iter *iter; + struct device *dev; - if (dev->type != &disk_type) - return 0; - if (!*k) - return 1; - (*k)--; - return 0; + iter = kmalloc(GFP_KERNEL, sizeof(*iter)); + 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); } -static void *part_start(struct seq_file *part, loff_t *pos) +static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) { struct device *dev; - loff_t n = *pos; - - if (!n) - part->private = (void *)1LU; /* tell show to print header */ - dev = class_find_device(&block_class, NULL, &n, find_start); + (*pos)++; + dev = class_dev_iter_next(seqf->private); if (dev) return dev_to_disk(dev); return NULL; } -static int find_next(struct device *dev, void *data) +static void disk_seqf_stop(struct seq_file *seqf, void *v) { - if (dev->type == &disk_type) - return 1; - return 0; -} + struct class_dev_iter *iter = seqf->private; -static void *part_next(struct seq_file *part, void *v, loff_t *pos) -{ - struct gendisk *gp = v; - struct device *dev; - ++*pos; - dev = class_find_device(&block_class, &gp->dev, NULL, find_next); - if (dev) { - put_device(dev); - return dev_to_disk(dev); + /* stop is called even after start failed :-( */ + if (iter) { + class_dev_iter_exit(iter); + kfree(iter); } - return NULL; } -static void part_stop(struct seq_file *part, void *v) +static void *show_partition_start(struct seq_file *seqf, loff_t *pos) { + static void *p; + + p = disk_seqf_start(seqf, pos); + if (!IS_ERR(p) && p) + seq_puts(seqf, "major minor #blocks name\n\n"); + return p; } static int show_partition(struct seq_file *part, void *v) @@ -383,9 +380,9 @@ static int show_partition(struct seq_file *part, void *v) } const struct seq_operations partitions_op = { - .start = part_start, - .next = part_next, - .stop = part_stop, + .start = show_partition_start, + .next = disk_seqf_next, + .stop = disk_seqf_stop, .show = show_partition }; #endif @@ -567,44 +564,6 @@ static struct device_type disk_type = { }; #ifdef CONFIG_PROC_FS -/* - * 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 void *diskstats_start(struct seq_file *part, loff_t *pos) -{ - struct device *dev; - loff_t n = *pos; - - dev = class_find_device(&block_class, NULL, &n, find_start); - if (dev) - return dev_to_disk(dev); - - return NULL; -} - -static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) -{ - struct gendisk *gp = v; - struct device *dev; - - ++*pos; - dev = class_find_device(&block_class, &gp->dev, NULL, find_next); - if (dev) { - put_device(dev); - return dev_to_disk(dev); - } - return NULL; -} - -static void diskstats_stop(struct seq_file *part, void *v) -{ -} - static int diskstats_show(struct seq_file *s, void *v) { struct gendisk *gp = v; @@ -666,9 +625,9 @@ static int diskstats_show(struct seq_file *s, void *v) } const struct seq_operations diskstats_op = { - .start = diskstats_start, - .next = diskstats_next, - .stop = diskstats_stop, + .start = disk_seqf_start, + .next = disk_seqf_next, + .stop = disk_seqf_stop, .show = diskstats_show }; #endif /* CONFIG_PROC_FS */ @@ -696,40 +655,23 @@ void genhd_media_change_notify(struct gendisk *disk) EXPORT_SYMBOL_GPL(genhd_media_change_notify); #endif /* 0 */ -struct find_block { - const char *name; - int part; -}; - -static int match_id(struct device *dev, void *data) +dev_t blk_lookup_devt(const char *name, int part) { - struct find_block *find = data; + dev_t devt = MKDEV(0, 0); + struct class_dev_iter iter; + struct device *dev; - if (dev->type != &disk_type) - return 0; - if (strcmp(dev->bus_id, find->name) == 0) { + class_dev_iter_init(&iter, &block_class, NULL, &disk_type); + while ((dev = class_dev_iter_next(&iter))) { struct gendisk *disk = dev_to_disk(dev); - if (find->part < disk->minors) - return 1; - } - return 0; -} -dev_t blk_lookup_devt(const char *name, int part) -{ - struct device *dev; - dev_t devt = MKDEV(0, 0); - struct find_block find; - - find.name = name; - find.part = part; - dev = class_find_device(&block_class, NULL, &find, match_id); - if (dev) { - put_device(dev); - devt = MKDEV(MAJOR(dev->devt), - MINOR(dev->devt) + part); + if (!strcmp(dev->bus_id, name) && part < disk->minors) { + devt = MKDEV(MAJOR(dev->devt), + MINOR(dev->devt) + part); + break; + } } - + class_dev_iter_exit(&iter); return devt; } EXPORT_SYMBOL(blk_lookup_devt); |