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btrfs: switch write_buf to kernel_write 

Instead of playing with the addressing limits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2017-09-01 17:39:19 +02:00 committed by Al Viro
parent 670986ec01
commit 8e93157bdd
1 changed files with 4 additions and 14 deletions
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18
fs/btrfs/send.c
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@ -539,33 +539,23 @@ static struct btrfs_path *alloc_path_for_send(void)
static int write_buf(struct file *filp, const void *buf, u32 len, loff_t *off)
{
int ret;
mm_segment_t old_fs;
u32 pos = 0;
old_fs = get_fs();
set_fs(KERNEL_DS);
while (pos < len) {
ret = vfs_write(filp, (__force const char __user *)buf + pos,
len - pos, off);
ret = kernel_write(filp, buf + pos, len - pos, off);
/* TODO handle that correctly */
/*if (ret == -ERESTARTSYS) {
continue;
}*/
if (ret < 0)
goto out;
return ret;
if (ret == 0) {
ret = -EIO;
goto out;
return -EIO;
}
pos += ret;
}
ret = 0;
out:
set_fs(old_fs);
return ret;
return 0;
}
static int tlv_put(struct send_ctx *sctx, u16 attr, const void *data, int len)