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authorNeilBrown <neilb@suse.de>2014-05-12 11:22:47 +1000
committerJ. Bruce Fields <bfields@redhat.com>2014-05-22 15:59:19 -0400
commit8658452e4a588da603f6cb5ee2615deafcd82b71 (patch)
tree5f2bdfa67fa8eb23d24958f541a1b8698185bc0b /fs/nfsd/vfs.c
parentef11ce24875a8a540adc185e7bce3d7d49c8296f (diff)
downloadlinux-8658452e4a588da603f6cb5ee2615deafcd82b71.tar.bz2
nfsd: Only set PF_LESS_THROTTLE when really needed.
PF_LESS_THROTTLE has a very specific use case: to avoid deadlocks and live-locks while writing to the page cache in a loop-back NFS mount situation. It therefore makes sense to *only* set PF_LESS_THROTTLE in this situation. We now know when a request came from the local-host so it could be a loop-back mount. We already know when we are handling write requests, and when we are doing anything else. So combine those two to allow nfsd to still be throttled (like any other process) in every situation except when it is known to be problematic. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/vfs.c')
-rw-r--r--fs/nfsd/vfs.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 6aaa3057683a..3aa38523b6d7 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -908,6 +908,16 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
int stable = *stablep;
int use_wgather;
loff_t pos = offset;
+ unsigned int pflags = current->flags;
+
+ if (rqstp->rq_local)
+ /*
+ * We want less throttling in balance_dirty_pages()
+ * and shrink_inactive_list() so that nfs to
+ * localhost doesn't cause nfsd to lock up due to all
+ * the client's dirty pages or its congested queue.
+ */
+ current->flags |= PF_LESS_THROTTLE;
dentry = file->f_path.dentry;
inode = dentry->d_inode;
@@ -941,6 +951,8 @@ out_nfserr:
err = 0;
else
err = nfserrno(host_err);
+ if (rqstp->rq_local)
+ tsk_restore_flags(current, pflags, PF_LESS_THROTTLE);
return err;
}