android/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

sd: notify block layer when using temporary change to cache_type

Browse Source 
This is a fix for commit 39c60a0948

  "sd: fix array cache flushing bug causing performance problems"

We must notify the block layer via q->flush_flags after a temporary change
of the cache_type to write through.  Without this, a SYNCHRONIZE CACHE
command will still be generated.  This patch factors out a helper that
can be called from sd_revalidate_disk and cache_type_store.

Signed-off-by: Vaughan Cao <vaughan.cao@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Vaughan Cao 2014-06-03 17:37:30 +08:00 committed by Christoph Hellwig
parent 6bb5e6e772
commit cb2fb68d06
1 changed files with 15 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/scsi/sd.c
View File

@ -134,6 +134,19 @@ static const char *sd_cache_types[] = {
"write back, no read (daft)" "write back, no read (daft)"
}; };
static void sd_set_flush_flag(struct scsi_disk *sdkp)
{
unsigned flush = 0;
if (sdkp->WCE) {
flush |= REQ_FLUSH;
if (sdkp->DPOFUA)
flush |= REQ_FUA;
}
blk_queue_flush(sdkp->disk->queue, flush);
}
static ssize_t static ssize_t
cache_type_store(struct device *dev, struct device_attribute *attr, cache_type_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count) const char *buf, size_t count)
@ -177,6 +190,7 @@ cache_type_store(struct device *dev, struct device_attribute *attr,
if (sdkp->cache_override) { if (sdkp->cache_override) {
sdkp->WCE = wce; sdkp->WCE = wce;
sdkp->RCD = rcd; sdkp->RCD = rcd;
sd_set_flush_flag(sdkp);
return count; return count;
} }
@ -2698,7 +2712,6 @@ static int sd_revalidate_disk(struct gendisk *disk)
struct scsi_disk *sdkp = scsi_disk(disk); struct scsi_disk *sdkp = scsi_disk(disk);
struct scsi_device *sdp = sdkp->device; struct scsi_device *sdp = sdkp->device;
unsigned char *buffer; unsigned char *buffer;
unsigned flush = 0;
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
"sd_revalidate_disk\n")); "sd_revalidate_disk\n"));
@ -2744,13 +2757,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
* We now have all cache related info, determine how we deal * We now have all cache related info, determine how we deal
* with flush requests. * with flush requests.
*/ */
if (sdkp->WCE) { sd_set_flush_flag(sdkp);
flush |= REQ_FLUSH;
if (sdkp->DPOFUA)
flush |= REQ_FUA;
}
blk_queue_flush(sdkp->disk->queue, flush);
set_capacity(disk, sdkp->capacity); set_capacity(disk, sdkp->capacity);
sd_config_write_same(sdkp); sd_config_write_same(sdkp);