inode_congested9
Test whether an inode is congested
Usage
int inode_congested(struct inode * inode, int cong_bits);
Arguments
inode
inode to test for congestion (may be NULL)
cong_bits
mask of WB_[a]sync_congested bits to test
Overview
Tests whether inode is congested. cong_bits is the mask of congestion bits to test and the return value is the mask of set bits.
If cgroup writeback is enabled for inode, the congestion state is determined by whether the cgwb (cgroup bdi_writeback) for the blkcg associated with inode is congested; otherwise, the root wb's congestion state is used.
inode is allowed to be NULL as this function is often called on mapping->host which is NULL for the swapper space.