support make_ext4fs

[firefly-linux-kernel-4.4.55.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index f40a4aa1ba8d1fe904c3e617084237c95fde6ae2..2085707426829aea9d3056bac5377b15a6db1ade 100755 (executable)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1205,6 +1205,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                        if (!bdev->bd_part)
                                goto out_clear;
 
+                       ret = 0;
                        if (disk->fops->open) {
                                ret = disk->fops->open(bdev, mode);
                                if (ret == -ERESTARTSYS) {
@@ -1220,9 +1221,18 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                                        mutex_unlock(&bdev->bd_mutex);
                                        goto restart;
                                }
-                               if (ret)
-                                       goto out_clear;
                        }
+                       /*
+                        * If the device is invalidated, rescan partition
+                        * if open succeeded or failed with -ENOMEDIUM.
+                        * The latter is necessary to prevent ghost
+                        * partitions on a removed medium.
+                        */
+                       if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
+                               rescan_partitions(disk, bdev);
+                       if (ret)
+                               goto out_clear;
+
                        if (!bdev->bd_openers) {
                                bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
                                bdi = blk_get_backing_dev_info(bdev);
@@ -1230,8 +1240,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                                        bdi = &default_backing_dev_info;
                                bdev->bd_inode->i_data.backing_dev_info = bdi;
                        }
-                       if (bdev->bd_invalidated)
-                               rescan_partitions(disk, bdev);
                } else {
                        struct block_device *whole;
                        whole = bdget_disk(disk, 0);
@@ -1258,13 +1266,14 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                put_disk(disk);
                disk = NULL;
                if (bdev->bd_contains == bdev) {
-                       if (bdev->bd_disk->fops->open) {
+                       ret = 0;
+                       if (bdev->bd_disk->fops->open)
                                ret = bdev->bd_disk->fops->open(bdev, mode);
-                               if (ret)
-                                       goto out_unlock_bdev;
-                       }
-                       if (bdev->bd_invalidated)
+                       /* the same as first opener case, read comment there */
+                       if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
                                rescan_partitions(bdev->bd_disk, bdev);
+                       if (ret)
+                               goto out_unlock_bdev;
                }
        }
        bdev->bd_openers++;
@@ -1471,15 +1480,23 @@ static const struct address_space_operations def_blk_aops = {
 ssize_t mydo_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
 {
     unsigned long buf_addr = (unsigned long)buf;
-    if(memcmp(filp->f_mapping->host->i_bdev->bd_disk->disk_name, "mtdblock", 8) == 0 )// kernel mem is usb tran &&(buf_addr >= 0xc0000000)
+    if((memcmp(filp->f_mapping->host->i_bdev->bd_disk->disk_name, "mtdblock", 8) == 0) &&(buf_addr >= 0xc0000000))// kernel mem is usb tran &&(buf_addr >= 0xc0000000)
     {
         struct mtd_blktrans_dev *dev;
         struct mtd_blktrans_ops *tr;
+        struct mtd_info *mtd;
+        
         dev = (filp->f_mapping->host->i_bdev->bd_disk->private_data);
+        mtd = dev->mtd;
+        /*if((buf_addr < 0xc0000000)&&(mtd->name[0]=='u' &&mtd->name[3]=='r' && mtd->name[4]==0)) // user part 
+        {
+            return(do_sync_read(filp, buf,len,ppos));
+        }*/
         tr = dev->tr;
-
                if (!tr->readsect)
-                       return 0;
+               {
+                       return(do_sync_read(filp, buf,len,ppos));
+           }
         //printk("mydo_sync_read buf = 0x%lx LBA = 0x%lx len = 0x%x \n",buf, (unsigned long)(*ppos>>9),len);
         if(tr->readsect(dev, (unsigned long)(*ppos>>9), len>>9, buf))
         {
@@ -1498,11 +1515,20 @@ ssize_t mydo_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *
 ssize_t mydo_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
 {
     unsigned long buf_addr = (unsigned long)buf;
-    if(memcmp(filp->f_mapping->host->i_bdev->bd_disk->disk_name, "mtdblock", 8) == 0)// kernel mem is usb tran &&(buf_addr >= 0xc0000000)
+    if((memcmp(filp->f_mapping->host->i_bdev->bd_disk->disk_name, "mtdblock", 8) == 0) &&(buf_addr >= 0xc0000000))// kernel mem is usb tran &&(buf_addr >= 0xc0000000)
     {
         struct mtd_blktrans_dev *dev;
         struct mtd_blktrans_ops *tr;
+        struct mtd_info *mtd;
+        
         dev = (filp->f_mapping->host->i_bdev->bd_disk->private_data);
+        
+        mtd = dev->mtd;
+        /*if((buf_addr < 0xc0000000)&&(mtd->name[0]=='u' &&mtd->name[3]=='r' && mtd->name[4]==0))
+        {
+            return(do_sync_write(filp, buf,len,ppos));
+        }*/
+
         tr = dev->tr;
 
                if (!tr->writesect)