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    Subject[PATCH 2/3] sysfs representation of stacked devices (dm)
    This patch modifies dm driver to create symlinks to/from
    underlying devices.

    --
    Jun'ichi Nomura, NEC Solutions (America), Inc.
    Exporting stacked device relationship to sysfs (dm)

    Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>

    --- linux-2.6.15.orig/drivers/md/dm.c 2006-01-02 22:21:10.000000000 -0500
    +++ linux-2.6.15/drivers/md/dm.c 2006-02-14 12:18:13.000000000 -0500
    @@ -853,6 +853,7 @@ static int __bind(struct mapped_device *

    dm_table_get(t);
    dm_table_event_callback(t, event_callback, md);
    + dm_link_device(md, t);

    write_lock(&md->map_lock);
    md->map = t;
    @@ -873,6 +874,7 @@ static void __unbind(struct mapped_devic
    write_lock(&md->map_lock);
    md->map = NULL;
    write_unlock(&md->map_lock);
    + dm_unlink_device(md, map);
    dm_table_put(map);
    }

    --- linux-2.6.15.orig/drivers/md/dm.h 2006-01-02 22:21:10.000000000 -0500
    +++ linux-2.6.15/drivers/md/dm.h 2006-02-14 12:21:10.000000000 -0500
    @@ -94,6 +94,12 @@ int dm_wait_event(struct mapped_device *
    struct gendisk *dm_disk(struct mapped_device *md);
    int dm_suspended(struct mapped_device *md);

    +/*
    + * kobject linking functions
    + */
    +int dm_link_device(struct mapped_device *md, struct dm_table *t);
    +int dm_unlink_device(struct mapped_device *md, struct dm_table *t);
    +
    /*-----------------------------------------------------------------
    * Functions for manipulating a table. Tables are also reference
    * counted.
    --- linux-2.6.15.orig/drivers/md/dm-table.c 2006-01-02 22:21:10.000000000 -0500
    +++ linux-2.6.15/drivers/md/dm-table.c 2006-02-16 23:25:49.000000000 -0500
    @@ -53,6 +53,9 @@ struct dm_table {
    /* events get handed up using this callback */
    void (*event_fn)(void *);
    void *event_context;
    +
    + /* sysfs deptree */
    + struct kobject slave_dir;
    };

    /*
    @@ -945,6 +948,43 @@ int dm_table_flush_all(struct dm_table *
    return ret;
    }

    +/* create sysfs symlinks between mapped device and underlying devices */
    +int dm_link_device(struct mapped_device *md, struct dm_table *t)
    +{
    + struct list_head *d, *devices;
    + struct kobject *md_kobj;
    +
    + md_kobj = &dm_disk(md)->kobj;
    + stackdev_init(&t->slave_dir, md_kobj);
    +
    + devices = dm_table_get_devices(t);
    + for (d = devices->next; d != devices; d = d->next) {
    + struct dm_dev *dd = list_entry(d, struct dm_dev, list);
    + stackdev_link(dd->bdev, &t->slave_dir, md_kobj);
    + }
    +
    + return 0;
    +}
    +
    +/* remove sysfs symlinks between mapped device and underlying devices */
    +int dm_unlink_device(struct mapped_device *md, struct dm_table *t)
    +{
    + struct list_head *d, *devices;
    + struct kobject *md_kobj;
    +
    + md_kobj = &dm_disk(md)->kobj;
    +
    + devices = dm_table_get_devices(t);
    + for (d = devices->next; d != devices; d = d->next) {
    + struct dm_dev *dd = list_entry(d, struct dm_dev, list);
    + stackdev_unlink(dd->bdev, &t->slave_dir, md_kobj);
    + }
    +
    + stackdev_clear(&t->slave_dir);
    +
    + return 0;
    +}
    +
    EXPORT_SYMBOL(dm_vcalloc);
    EXPORT_SYMBOL(dm_get_device);
    EXPORT_SYMBOL(dm_put_device);
    \
     
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      Last update: 2006-02-17 19:05    [W:0.028 / U:30.500 seconds]
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