From: Fabian Frederick <fabf@xxxxxxxxx> Subject: 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@xxxxxxxxxx: fix return value check in affs_get_parent()] Link: http://lkml.kernel.org/r/20170123141018.2331-1-weiyj.lk@xxxxxxxxx Link: http://lkml.kernel.org/r/20170109191208.6085-8-fabf@xxxxxxxxx Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx> Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx> Suggested-by: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/affs/namei.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff -puN fs/affs/namei.c~fs-affs-make-export-work-with-cold-dcache fs/affs/namei.c --- a/fs/affs/namei.c~fs-affs-make-export-work-with-cold-dcache +++ a/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( 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 = { _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
