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teach nfs_get_link() to work in RCU mode

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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>
This commit is contained in:
Al Viro 2015-11-17 21:14:24 -05:00
parent 1a384eaac2
commit 0d0def49d0
3 changed files with 42 additions and 10 deletions
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21
fs/nfs/inode.c
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@ -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