![Josef Bacik](/assets/img/avatar_default.png)
Btrfs needs to be able to control how filemap_write_and_wait_range() is called in fsync to make it less of a painful operation, so push down taking i_mutex and the calling of filemap_write_and_wait() down into the ->fsync() handlers. Some file systems can drop taking the i_mutex altogether it seems, like ext3 and ocfs2. For correctness sake I just pushed everything down in all cases to make sure that we keep the current behavior the same for everybody, and then each individual fs maintainer can make up their mind about what to do from there. Thanks, Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
482 lines
11 KiB
C
482 lines
11 KiB
C
/*
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* PS3 FLASH ROM Storage Driver
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*
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* Copyright (C) 2007 Sony Computer Entertainment Inc.
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* Copyright 2007 Sony Corp.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published
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* by the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <asm/lv1call.h>
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#include <asm/ps3stor.h>
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#define DEVICE_NAME "ps3flash"
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#define FLASH_BLOCK_SIZE (256*1024)
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struct ps3flash_private {
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struct mutex mutex; /* Bounce buffer mutex */
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u64 chunk_sectors;
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int tag; /* Start sector of buffer, -1 if invalid */
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bool dirty;
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};
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static struct ps3_storage_device *ps3flash_dev;
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static int ps3flash_read_write_sectors(struct ps3_storage_device *dev,
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u64 start_sector, int write)
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{
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
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u64 res = ps3stor_read_write_sectors(dev, dev->bounce_lpar,
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start_sector, priv->chunk_sectors,
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write);
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if (res) {
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dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
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__LINE__, write ? "write" : "read", res);
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return -EIO;
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}
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return 0;
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}
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static int ps3flash_writeback(struct ps3_storage_device *dev)
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{
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
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int res;
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if (!priv->dirty || priv->tag < 0)
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return 0;
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res = ps3flash_read_write_sectors(dev, priv->tag, 1);
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if (res)
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return res;
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priv->dirty = false;
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return 0;
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}
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static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector)
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{
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
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int res;
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if (start_sector == priv->tag)
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return 0;
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res = ps3flash_writeback(dev);
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if (res)
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return res;
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priv->tag = -1;
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res = ps3flash_read_write_sectors(dev, start_sector, 0);
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if (res)
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return res;
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priv->tag = start_sector;
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return 0;
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}
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static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
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{
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struct ps3_storage_device *dev = ps3flash_dev;
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loff_t res;
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mutex_lock(&file->f_mapping->host->i_mutex);
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switch (origin) {
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case 0:
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break;
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case 1:
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offset += file->f_pos;
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break;
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case 2:
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offset += dev->regions[dev->region_idx].size*dev->blk_size;
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break;
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default:
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offset = -1;
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}
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if (offset < 0) {
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res = -EINVAL;
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goto out;
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}
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file->f_pos = offset;
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res = file->f_pos;
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out:
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mutex_unlock(&file->f_mapping->host->i_mutex);
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return res;
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}
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static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf,
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size_t count, loff_t *pos)
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{
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struct ps3_storage_device *dev = ps3flash_dev;
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
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u64 size, sector, offset;
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int res;
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size_t remaining, n;
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const void *src;
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dev_dbg(&dev->sbd.core,
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"%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n",
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__func__, __LINE__, count, *pos, userbuf, kernelbuf);
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size = dev->regions[dev->region_idx].size*dev->blk_size;
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if (*pos >= size || !count)
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return 0;
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if (*pos + count > size) {
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dev_dbg(&dev->sbd.core,
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"%s:%u Truncating count from %zu to %llu\n", __func__,
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__LINE__, count, size - *pos);
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count = size - *pos;
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}
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sector = *pos / dev->bounce_size * priv->chunk_sectors;
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offset = *pos % dev->bounce_size;
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remaining = count;
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do {
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n = min_t(u64, remaining, dev->bounce_size - offset);
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src = dev->bounce_buf + offset;
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mutex_lock(&priv->mutex);
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res = ps3flash_fetch(dev, sector);
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if (res)
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goto fail;
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dev_dbg(&dev->sbd.core,
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"%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n",
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__func__, __LINE__, n, src, userbuf, kernelbuf);
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if (userbuf) {
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if (copy_to_user(userbuf, src, n)) {
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res = -EFAULT;
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goto fail;
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}
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userbuf += n;
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}
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if (kernelbuf) {
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memcpy(kernelbuf, src, n);
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kernelbuf += n;
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}
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mutex_unlock(&priv->mutex);
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*pos += n;
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remaining -= n;
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sector += priv->chunk_sectors;
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offset = 0;
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} while (remaining > 0);
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return count;
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fail:
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mutex_unlock(&priv->mutex);
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return res;
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}
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static ssize_t ps3flash_write(const char __user *userbuf,
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const void *kernelbuf, size_t count, loff_t *pos)
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{
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struct ps3_storage_device *dev = ps3flash_dev;
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
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u64 size, sector, offset;
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int res = 0;
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size_t remaining, n;
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void *dst;
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dev_dbg(&dev->sbd.core,
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"%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n",
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__func__, __LINE__, count, *pos, userbuf, kernelbuf);
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size = dev->regions[dev->region_idx].size*dev->blk_size;
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if (*pos >= size || !count)
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return 0;
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if (*pos + count > size) {
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dev_dbg(&dev->sbd.core,
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"%s:%u Truncating count from %zu to %llu\n", __func__,
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__LINE__, count, size - *pos);
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count = size - *pos;
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}
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sector = *pos / dev->bounce_size * priv->chunk_sectors;
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offset = *pos % dev->bounce_size;
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remaining = count;
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do {
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n = min_t(u64, remaining, dev->bounce_size - offset);
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dst = dev->bounce_buf + offset;
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mutex_lock(&priv->mutex);
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if (n != dev->bounce_size)
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res = ps3flash_fetch(dev, sector);
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else if (sector != priv->tag)
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res = ps3flash_writeback(dev);
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if (res)
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goto fail;
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dev_dbg(&dev->sbd.core,
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"%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n",
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__func__, __LINE__, n, userbuf, kernelbuf, dst);
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if (userbuf) {
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if (copy_from_user(dst, userbuf, n)) {
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res = -EFAULT;
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goto fail;
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}
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userbuf += n;
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}
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if (kernelbuf) {
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memcpy(dst, kernelbuf, n);
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kernelbuf += n;
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}
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priv->tag = sector;
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priv->dirty = true;
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mutex_unlock(&priv->mutex);
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*pos += n;
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remaining -= n;
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sector += priv->chunk_sectors;
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offset = 0;
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} while (remaining > 0);
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return count;
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fail:
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mutex_unlock(&priv->mutex);
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return res;
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}
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static ssize_t ps3flash_user_read(struct file *file, char __user *buf,
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size_t count, loff_t *pos)
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{
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return ps3flash_read(buf, NULL, count, pos);
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}
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static ssize_t ps3flash_user_write(struct file *file, const char __user *buf,
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size_t count, loff_t *pos)
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{
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return ps3flash_write(buf, NULL, count, pos);
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}
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static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos)
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{
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return ps3flash_read(NULL, buf, count, &pos);
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}
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static ssize_t ps3flash_kernel_write(const void *buf, size_t count,
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loff_t pos)
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{
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ssize_t res;
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int wb;
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res = ps3flash_write(NULL, buf, count, &pos);
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if (res < 0)
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return res;
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/* Make kernel writes synchronous */
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wb = ps3flash_writeback(ps3flash_dev);
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if (wb)
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return wb;
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return res;
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}
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static int ps3flash_flush(struct file *file, fl_owner_t id)
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{
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return ps3flash_writeback(ps3flash_dev);
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}
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static int ps3flash_fsync(struct file *file, loff_t start, loff_t end, int datasync)
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{
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struct inode *inode = file->f_path.dentry->d_inode;
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int err;
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mutex_lock(&inode->i_mutex);
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err = ps3flash_writeback(ps3flash_dev);
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mutex_unlock(&inode->i_mutex);
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return err;
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}
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static irqreturn_t ps3flash_interrupt(int irq, void *data)
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{
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struct ps3_storage_device *dev = data;
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int res;
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u64 tag, status;
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res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
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if (tag != dev->tag)
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dev_err(&dev->sbd.core,
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"%s:%u: tag mismatch, got %llx, expected %llx\n",
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__func__, __LINE__, tag, dev->tag);
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if (res) {
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dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
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__func__, __LINE__, res, status);
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} else {
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dev->lv1_status = status;
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complete(&dev->done);
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}
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return IRQ_HANDLED;
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}
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static const struct file_operations ps3flash_fops = {
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.owner = THIS_MODULE,
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.llseek = ps3flash_llseek,
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.read = ps3flash_user_read,
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.write = ps3flash_user_write,
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.flush = ps3flash_flush,
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.fsync = ps3flash_fsync,
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};
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static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = {
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.read = ps3flash_kernel_read,
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.write = ps3flash_kernel_write,
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};
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static struct miscdevice ps3flash_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = DEVICE_NAME,
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.fops = &ps3flash_fops,
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};
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static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
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{
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struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
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struct ps3flash_private *priv;
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int error;
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unsigned long tmp;
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tmp = dev->regions[dev->region_idx].start*dev->blk_size;
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if (tmp % FLASH_BLOCK_SIZE) {
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dev_err(&dev->sbd.core,
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"%s:%u region start %lu is not aligned\n", __func__,
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__LINE__, tmp);
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return -EINVAL;
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}
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tmp = dev->regions[dev->region_idx].size*dev->blk_size;
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if (tmp % FLASH_BLOCK_SIZE) {
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dev_err(&dev->sbd.core,
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"%s:%u region size %lu is not aligned\n", __func__,
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__LINE__, tmp);
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return -EINVAL;
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}
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/* use static buffer, kmalloc cannot allocate 256 KiB */
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if (!ps3flash_bounce_buffer.address)
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return -ENODEV;
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if (ps3flash_dev) {
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dev_err(&dev->sbd.core,
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"Only one FLASH device is supported\n");
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return -EBUSY;
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}
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ps3flash_dev = dev;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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error = -ENOMEM;
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goto fail;
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}
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ps3_system_bus_set_drvdata(&dev->sbd, priv);
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mutex_init(&priv->mutex);
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priv->tag = -1;
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dev->bounce_size = ps3flash_bounce_buffer.size;
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dev->bounce_buf = ps3flash_bounce_buffer.address;
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priv->chunk_sectors = dev->bounce_size / dev->blk_size;
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error = ps3stor_setup(dev, ps3flash_interrupt);
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if (error)
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goto fail_free_priv;
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ps3flash_misc.parent = &dev->sbd.core;
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error = misc_register(&ps3flash_misc);
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if (error) {
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dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
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__func__, __LINE__, error);
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goto fail_teardown;
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}
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dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
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__func__, __LINE__, ps3flash_misc.minor);
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ps3_os_area_flash_register(&ps3flash_kernel_ops);
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return 0;
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fail_teardown:
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ps3stor_teardown(dev);
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fail_free_priv:
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kfree(priv);
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ps3_system_bus_set_drvdata(&dev->sbd, NULL);
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fail:
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ps3flash_dev = NULL;
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return error;
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}
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static int ps3flash_remove(struct ps3_system_bus_device *_dev)
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{
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struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
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ps3_os_area_flash_register(NULL);
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misc_deregister(&ps3flash_misc);
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ps3stor_teardown(dev);
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kfree(ps3_system_bus_get_drvdata(&dev->sbd));
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ps3_system_bus_set_drvdata(&dev->sbd, NULL);
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ps3flash_dev = NULL;
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return 0;
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}
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static struct ps3_system_bus_driver ps3flash = {
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.match_id = PS3_MATCH_ID_STOR_FLASH,
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.core.name = DEVICE_NAME,
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.core.owner = THIS_MODULE,
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.probe = ps3flash_probe,
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.remove = ps3flash_remove,
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.shutdown = ps3flash_remove,
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};
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static int __init ps3flash_init(void)
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{
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return ps3_system_bus_driver_register(&ps3flash);
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}
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static void __exit ps3flash_exit(void)
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{
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ps3_system_bus_driver_unregister(&ps3flash);
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}
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module_init(ps3flash_init);
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module_exit(ps3flash_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
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MODULE_AUTHOR("Sony Corporation");
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MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);
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