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| author | Al Viro | 2015-11-18 03:14:24 +0100 |
|---|---|---|
| committer | Al Viro | 2015-12-09 04:41:55 +0100 |
| commit | 0d0def49d05ae988936268b0e57d19aeef8c3ad2 (patch) | |
| tree | 471fbf67f67815197aea2540650ee73d754b40ac /fs/nfs/inode.c | |
| parent | teach proc_self_get_link()/proc_thread_self_get_link() to work in RCU mode (diff) | |
| download | kernel-qcow2-linux-0d0def49d05ae988936268b0e57d19aeef8c3ad2.tar.gz kernel-qcow2-linux-0d0def49d05ae988936268b0e57d19aeef8c3ad2.tar.xz kernel-qcow2-linux-0d0def49d05ae988936268b0e57d19aeef8c3ad2.zip | |
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.c | 21 |
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 |