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    Subject[PATCH 15/22 take 3] UBI: sysfs functionality
    diff -auNrp tmp-from/drivers/mtd/ubi/sysfs.c tmp-to/drivers/mtd/ubi/sysfs.c
    --- tmp-from/drivers/mtd/ubi/sysfs.c 1970-01-01 02:00:00.000000000 +0200
    +++ tmp-to/drivers/mtd/ubi/sysfs.c 2007-03-14 17:15:50.000000000 +0200
    @@ -0,0 +1,408 @@
    +/*
    + * Copyright (c) International Business Machines Corp., 2006
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
    + * the GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    + *
    + * Author: Artem B. Bityutskiy
    + */
    +
    +#include <linux/kobject.h>
    +#include <linux/stat.h>
    +#include "ubi.h"
    +
    +static struct class *ubi_class;
    +
    +/* "Show" and "store" methods for files in '/<sysfs>/class/ubi/' */
    +static ssize_t ubi_version_show(struct class *class, char *buf)
    +{
    + return sprintf(buf, "%d\n", UBI_VERSION);
    +}
    +
    +/* Class attributes corresponding to files in '/<sysfs>/class/ubi/' */
    +static struct class_attribute ubi_version =
    + __ATTR(version, S_IRUGO, ubi_version_show, NULL);
    +
    +/**
    + * ubi_sysfs_infr_init - initialize UBI sysfs infrastructure support.
    + *
    + * This function returns zero in case of success and a negative error code in
    + * case of failure.
    + */
    +int ubi_sysfs_infr_init(void)
    +{
    + int err;
    +
    + ubi_class = class_create(THIS_MODULE, UBI_STRING_NAME);
    + if (IS_ERR(ubi_class))
    + return PTR_ERR(ubi_class);
    +
    + err = class_create_file(ubi_class, &ubi_version);
    + if (err)
    + goto out_class;
    +
    + return 0;
    +
    +out_class:
    + class_destroy(ubi_class);
    + return err;
    +}
    +
    +/**
    + * ubi_sysfs_infr_close - close UBI sysfs infrastructure.
    + */
    +void ubi_sysfs_infr_close(void)
    +{
    + class_remove_file(ubi_class, &ubi_version);
    + class_destroy(ubi_class);
    +}
    +
    +/**
    + * dev2ubi - find UBI device description object by the pointer to the device
    + * object.
    + *
    + * @dev: device object pointer
    + *
    + * This function returns a pointer to the UBI device description object.
    + */
    +static inline struct ubi_info *dev2ubi(struct device *dev)
    +{
    + return container_of(dev, struct ubi_info, uif.dev);
    +}
    +
    +static ssize_t dev_attribute_show(struct device *dev,
    + struct device_attribute *attr, char *buf);
    +
    +/*
    + * Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX'.
    + */
    +static struct device_attribute dev_eraseblock_size =
    + __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_avail_eraseblocks =
    + __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_total_eraseblocks =
    + __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_volumes_count =
    + __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_max_ec =
    + __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_reserved_for_bad =
    + __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_bad_peb_count =
    + __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_max_vol_count =
    + __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_min_io_size =
    + __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL);
    +static struct device_attribute dev_bgt_enabled =
    + __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL);
    +
    +/* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */
    +static ssize_t dev_attribute_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + const struct ubi_info *ubi = dev2ubi(dev);
    +
    + if (attr == &dev_eraseblock_size)
    + return sprintf(buf, "%d\n", ubi->io.leb_size);
    + else if (attr == &dev_avail_eraseblocks)
    + return sprintf(buf, "%d\n", ubi->acc.avail_pebs);
    + else if (attr == &dev_total_eraseblocks)
    + return sprintf(buf, "%d\n", ubi->io.good_peb_count);
    + else if (attr == &dev_volumes_count)
    + return sprintf(buf, "%d\n", ubi->vtbl.vol_count);
    + else if (attr == &dev_max_ec)
    + return sprintf(buf, "%d\n", ubi->wl.max_ec);
    + else if (attr == &dev_reserved_for_bad)
    + return sprintf(buf, "%d\n", ubi->acc.beb_rsvd_pebs);
    + else if (attr == &dev_bad_peb_count)
    + return sprintf(buf, "%d\n", ubi->io.bad_peb_count);
    + else if (attr == &dev_max_vol_count)
    + return sprintf(buf, "%d\n", ubi->vtbl.vt_slots);
    + else if (attr == &dev_min_io_size)
    + return sprintf(buf, "%d\n", ubi->io.min_io_size);
    + else if (attr == &dev_bgt_enabled) {
    + return sprintf(buf, "%d\n", ubi->wl.thread_enabled);
    + }
    +
    + return 0;
    +}
    +
    +/* "Release" method for UBI devices */
    +static void dev_release(struct device *dev)
    +{
    + return;
    +}
    +
    +/**
    + * ubi_sysfs_init - initialize sysfs for an UBI device.
    + *
    + * @ubi: the UBI device description object
    + *
    + * This function returns zero in case of success and a negative error code in
    + * case of failure.
    + */
    +int ubi_sysfs_init(struct ubi_info *ubi)
    +{
    + int err;
    +
    + ubi->uif.dev.release = dev_release;
    + ubi->uif.dev.devt = MKDEV(ubi->uif.major, 0);
    + ubi->uif.dev.class = ubi_class;
    + sprintf(&ubi->uif.dev.bus_id[0], UBI_STRING_NAME"%d", ubi->ubi_num);
    + err = device_register(&ubi->uif.dev);
    + if (err)
    + goto out;
    +
    + err = device_create_file(&ubi->uif.dev, &dev_eraseblock_size);
    + if (err)
    + goto out_unregister;
    + err = device_create_file(&ubi->uif.dev, &dev_avail_eraseblocks);
    + if (err)
    + goto out_eraseblock_size;
    + err = device_create_file(&ubi->uif.dev, &dev_total_eraseblocks);
    + if (err)
    + goto out_avail_eraseblocks;
    + err = device_create_file(&ubi->uif.dev, &dev_volumes_count);
    + if (err)
    + goto out_total_eraseblocks;
    + err = device_create_file(&ubi->uif.dev, &dev_max_ec);
    + if (err)
    + goto out_volumes_count;
    + err = device_create_file(&ubi->uif.dev, &dev_reserved_for_bad);
    + if (err)
    + goto out_volumes_max_ec;
    + err = device_create_file(&ubi->uif.dev, &dev_bad_peb_count);
    + if (err)
    + goto out_reserved_for_bad;
    + err = device_create_file(&ubi->uif.dev, &dev_max_vol_count);
    + if (err)
    + goto out_bad_peb_count;
    + err = device_create_file(&ubi->uif.dev, &dev_min_io_size);
    + if (err)
    + goto out_max_vol_count;
    + err = device_create_file(&ubi->uif.dev, &dev_bgt_enabled);
    + if (err)
    + goto out_min_io_size;
    +
    + return 0;
    +
    +out_min_io_size:
    + device_remove_file(&ubi->uif.dev, &dev_min_io_size);
    +out_max_vol_count:
    + device_remove_file(&ubi->uif.dev, &dev_max_vol_count);
    +out_bad_peb_count:
    + device_remove_file(&ubi->uif.dev, &dev_bad_peb_count);
    +out_reserved_for_bad:
    + device_remove_file(&ubi->uif.dev, &dev_reserved_for_bad);
    +out_volumes_max_ec:
    + device_remove_file(&ubi->uif.dev, &dev_max_ec);
    +out_volumes_count:
    + device_remove_file(&ubi->uif.dev, &dev_volumes_count);
    +out_total_eraseblocks:
    + device_remove_file(&ubi->uif.dev, &dev_total_eraseblocks);
    +out_avail_eraseblocks:
    + device_remove_file(&ubi->uif.dev, &dev_avail_eraseblocks);
    +out_eraseblock_size:
    + device_remove_file(&ubi->uif.dev, &dev_eraseblock_size);
    +out_unregister:
    + device_unregister(&ubi->uif.dev);
    +out:
    + ubi_err("failed to initialize sysfs for UBI device %d", ubi->ubi_num);
    + return err;
    +}
    +
    +/**
    + * ubi_sysfs_close - close sysfs for an UBI device.
    + *
    + * @ubi: the UBI device description object
    + */
    +void ubi_sysfs_close(struct ubi_info *ubi)
    +{
    + device_remove_file(&ubi->uif.dev, &dev_bgt_enabled);
    + device_remove_file(&ubi->uif.dev, &dev_min_io_size);
    + device_remove_file(&ubi->uif.dev, &dev_max_vol_count);
    + device_remove_file(&ubi->uif.dev, &dev_bad_peb_count);
    + device_remove_file(&ubi->uif.dev, &dev_reserved_for_bad);
    + device_remove_file(&ubi->uif.dev, &dev_max_ec);
    + device_remove_file(&ubi->uif.dev, &dev_volumes_count);
    + device_remove_file(&ubi->uif.dev, &dev_total_eraseblocks);
    + device_remove_file(&ubi->uif.dev, &dev_avail_eraseblocks);
    + device_remove_file(&ubi->uif.dev, &dev_eraseblock_size);
    + device_unregister(&ubi->uif.dev);
    +}
    +
    +/**
    + * dev2ubi - find volume description object by the pointer to the device
    + * object.
    + *
    + * @dev: device object pointer
    + *
    + * This function returns a pointer to the UBI volume description object.
    + */
    +static inline struct ubi_uif_volume *dev2vol(struct device *dev)
    +{
    + return container_of(dev, struct ubi_uif_volume, dev);
    +}
    +
    +static ssize_t vol_attribute_show(struct device *dev,
    + struct device_attribute *attr, char *buf);
    +
    +/* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */
    +static struct device_attribute vol_reserved_ebs =
    + __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL);
    +static struct device_attribute vol_type =
    + __ATTR(type, S_IRUGO, vol_attribute_show, NULL);
    +static struct device_attribute vol_name =
    + __ATTR(name, S_IRUGO, vol_attribute_show, NULL);
    +static struct device_attribute vol_corrupted =
    + __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL);
    +static struct device_attribute vol_alignment =
    + __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL);
    +static struct device_attribute vol_usable_eb_size =
    + __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL);
    +static struct device_attribute vol_data_bytes =
    + __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL);
    +static struct device_attribute vol_upd_marker =
    + __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL);
    +
    +/*
    + * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'.
    + *
    + * Consider a situation:
    + * A. process 1 opens a sysfs file related to volume Y, say
    + * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs;
    + * B. process 2 removes volume Y;
    + * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file;
    + *
    + * What we want to do in a situation like that is to return error when the file
    + * is read. This is done by means of the 'removed' flag and the 'vol_lock' of
    + * the UBI UIF volume information structure.
    + */
    +static ssize_t vol_attribute_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + int usable_eb_size, ret = 0;
    + const struct ubi_vtbl_vtr *vtr;
    + const char *tp;
    + struct ubi_uif_volume *vol = dev2vol(dev);
    +
    + spin_lock(&vol->vol_lock);
    + if (vol->removed) {
    + spin_unlock(&vol->vol_lock);
    + dbg_err("volume %d was removed", vol->vol_id);
    + return -EIO;
    + }
    + vtr = ubi_vtbl_get_vtr(vol->ubi, vol->vol_id);
    + if (attr == &vol_reserved_ebs)
    + ret = sprintf(buf, "%d\n", vtr->reserved_pebs);
    + else if (attr == &vol_type) {
    + tp = vtr->vol_type == UBI_DYNAMIC_VOLUME ? "dynamic" : "static";
    + ret = sprintf(buf, "%s\n", tp);
    + } else if (attr == &vol_name)
    + ret = sprintf(buf, "%s\n", vtr->name);
    + else if (attr == &vol_corrupted)
    + ret = sprintf(buf, "%d\n", vtr->corrupted);
    + else if (attr == &vol_alignment)
    + ret = sprintf(buf, "%d\n", vtr->alignment);
    + else if (attr == &vol_usable_eb_size) {
    + usable_eb_size = vol->ubi->io.leb_size - vtr->data_pad;
    + ret = sprintf(buf, "%d\n", usable_eb_size);
    + } else if (attr == &vol_data_bytes)
    + ret = sprintf(buf, "%lld\n", vtr->used_bytes);
    + else if (attr == &vol_upd_marker)
    + ret = sprintf(buf, "%d\n", vtr->upd_marker);
    + spin_unlock(&vol->vol_lock);
    + return ret;
    +}
    +
    +/* Release method for volume devices */
    +static void vol_release(struct device *dev)
    +{
    + const struct ubi_uif_volume *vol = dev2vol(dev);
    +
    + dbg_uif("release volume %d", vol->vol_id);
    + kfree(vol);
    +}
    +
    +/**
    + * ubi_sysfs_vol_init - initialize sysfs for an UBI volume.
    + *
    + * @ubi: the UBI device description object
    + * @vol: volume description object
    + *
    + * This function returns zero in case of success and a negative error code in
    + * case of failure.
    + *
    + * Note, this function does not free allocated resources in case of failure -
    + * the caller does it. This is because this would cause release() here and the
    + * caller would oops.
    + */
    +int ubi_sysfs_vol_init(struct ubi_info *ubi, struct ubi_uif_volume *vol)
    +{
    + int err;
    +
    + vol->dev.release = vol_release;
    + vol->dev.parent = &ubi->uif.dev;
    + vol->dev.devt = MKDEV(ubi->uif.major, vol->vol_id + 1);
    + vol->dev.class = ubi_class;
    + sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->uif.ubi_name, vol->vol_id);
    + err = device_register(&vol->dev);
    + if (err)
    + return err;
    +
    + err = device_create_file(&vol->dev, &vol_reserved_ebs);
    + if (err)
    + return err;
    + err = device_create_file(&vol->dev, &vol_type);
    + if (err)
    + return err;
    + err = device_create_file(&vol->dev, &vol_name);
    + if (err)
    + return err;
    + err = device_create_file(&vol->dev, &vol_corrupted);
    + if (err)
    + return err;
    + err = device_create_file(&vol->dev, &vol_alignment);
    + if (err)
    + return err;
    + err = device_create_file(&vol->dev, &vol_usable_eb_size);
    + if (err)
    + return err;
    + err = device_create_file(&vol->dev, &vol_data_bytes);
    + if (err)
    + return err;
    + err = device_create_file(&vol->dev, &vol_upd_marker);
    + if (err)
    + return err;
    + return 0;
    +}
    +
    +/**
    + * ubi_sysfs_vol_close - close sysfs for an UBI volume.
    + *
    + * @vol: volume description object
    + */
    +void ubi_sysfs_vol_close(struct ubi_uif_volume *vol)
    +{
    + device_remove_file(&vol->dev, &vol_upd_marker);
    + device_remove_file(&vol->dev, &vol_data_bytes);
    + device_remove_file(&vol->dev, &vol_usable_eb_size);
    + device_remove_file(&vol->dev, &vol_alignment);
    + device_remove_file(&vol->dev, &vol_corrupted);
    + device_remove_file(&vol->dev, &vol_name);
    + device_remove_file(&vol->dev, &vol_type);
    + device_remove_file(&vol->dev, &vol_reserved_ebs);
    + device_unregister(&vol->dev);
    +}
    -
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      Last update: 2007-03-14 16:33    [W:0.084 / U:59.536 seconds]
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