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authorAl Viro <viro@zeniv.linux.org.uk>2015-11-17 21:14:24 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-08 22:41:55 -0500
commit0d0def49d05ae988936268b0e57d19aeef8c3ad2 (patch)
tree471fbf67f67815197aea2540650ee73d754b40ac /fs/nfs/inode.c
parent1a384eaac265b57961c9696d9177f82eb84319e9 (diff)
teach nfs_get_link() to work in RCU mode
based upon the corresponding patch from Neil's March patchset, again with kmap-related horrors removed. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nfs/inode.c')
-rw-r--r--fs/nfs/inode.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index ae9aa0b8155c..aa828e8b6e04 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1087,6 +1087,27 @@ static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
|| NFS_STALE(inode);
}
+int nfs_revalidate_mapping_rcu(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ unsigned long *bitlock = &nfsi->flags;
+ int ret = 0;
+
+ if (IS_SWAPFILE(inode))
+ goto out;
+ if (nfs_mapping_need_revalidate_inode(inode)) {
+ ret = -ECHILD;
+ goto out;
+ }
+ spin_lock(&inode->i_lock);
+ if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
+ (nfsi->cache_validity & NFS_INO_INVALID_DATA))
+ ret = -ECHILD;
+ spin_unlock(&inode->i_lock);
+out:
+ return ret;
+}
+
/**
* __nfs_revalidate_mapping - Revalidate the pagecache
* @inode - pointer to host inode