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fs/affs: make export work with cold dcache

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This adds get_parent function so that nfs client can still work after
cache drop (Tested on NFS v4 with echo 3 > /proc/sys/vm/drop_caches)

[weiyongjun1@huawei.com: fix return value check in affs_get_parent()]
  Link: http://lkml.kernel.org/r/20170123141018.2331-1-weiyj.lk@gmail.com
Link: http://lkml.kernel.org/r/20170109191208.6085-8-fabf@skynet.be
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Suggested-by: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Fabian Frederick 2017-02-27 14:28:00 -08:00 committed by Linus Torvalds
parent f567accb3f
commit b3b42c0dea
1 changed files with 19 additions and 0 deletions
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19
fs/affs/namei.c
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@ -447,6 +447,24 @@ done:
return retval;
}
static struct dentry *affs_get_parent(struct dentry *child)
{
struct inode *parent;
struct buffer_head *bh;
bh = affs_bread(child->d_sb, d_inode(child)->i_ino);
if (!bh)
return ERR_PTR(-EIO);
parent = affs_iget(child->d_sb,
be32_to_cpu(AFFS_TAIL(child->d_sb, bh)->parent));
brelse(bh);
if (IS_ERR(parent))
return ERR_CAST(parent);
return d_obtain_alias(parent);
}
static struct inode *affs_nfs_get_inode(struct super_block *sb, u64 ino,
u32 generation)
{
@ -484,6 +502,7 @@ static struct dentry *affs_fh_to_parent(struct super_block *sb, struct fid *fid,
const struct export_operations affs_export_ops = {
.fh_to_dentry = affs_fh_to_dentry,
.fh_to_parent = affs_fh_to_parent,
.get_parent = affs_get_parent,
};
const struct dentry_operations affs_dentry_operations = {