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authorFabian Frederick <fabf@skynet.be>2017-02-27 14:28:00 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-27 18:43:46 -0800
commitb3b42c0deaa1a2fb84508b808385b8a78819f4df (patch)
treecfa418ddf1ee87f0b3221f707522cb2922889846 /fs/affs
parentf567accb3ff4a6ac9a2a50d33e29a076afc7dd2e (diff)
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fs/affs: make export work with cold dcache
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>
Diffstat (limited to 'fs/affs')
-rw-r--r--fs/affs/namei.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index fb88446bafef..96dd1d09a273 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -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 = {