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Subject[PATCH 48/80] staging: lustre: llite: a few fixes about readdir of striped dir.
Date
From: wang di <di.wang@intel.com>

Normally we know the value of op_mea1 when ll_readdir is called.
In the case of '.' or '..' op_mea1 is unknown so for that case
fetch the real parents FID.

Signed-off-by: wang di <di.wang@intel.com>
Signed-off-by: Li Xi <lixi@ddn.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4603
Reviewed-on: http://review.whamcloud.com/9191
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Li Xi <pkuelelixi@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
---
drivers/staging/lustre/lustre/llite/dir.c | 27 +++++++++++++++++
.../staging/lustre/lustre/llite/llite_internal.h | 1 +
drivers/staging/lustre/lustre/llite/llite_nfs.c | 31 ++++++++++++++------
3 files changed, 50 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
index 924b5df..3fed80d 100644
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -622,6 +622,33 @@ static int ll_readdir(struct file *filp, struct dir_context *ctx)
goto out;
}

+ if (unlikely(op_data->op_mea1)) {
+ /*
+ * This is only needed for striped dir to fill ..,
+ * see lmv_read_page
+ */
+ if (file_dentry(filp)->d_parent &&
+ file_dentry(filp)->d_parent->d_inode) {
+ __u64 ibits = MDS_INODELOCK_UPDATE;
+ struct inode *parent;
+
+ parent = file_dentry(filp)->d_parent->d_inode;
+ if (ll_have_md_lock(parent, &ibits, LCK_MINMODE))
+ op_data->op_fid3 = *ll_inode2fid(parent);
+ }
+
+ /*
+ * If it can not find in cache, do lookup .. on the master
+ * object
+ */
+ if (fid_is_zero(&op_data->op_fid3)) {
+ rc = ll_dir_get_parent_fid(inode, &op_data->op_fid3);
+ if (rc) {
+ ll_finish_md_op_data(op_data);
+ return rc;
+ }
+ }
+ }
ctx->pos = pos;
rc = ll_dir_read(inode, &pos, op_data, ctx);
pos = ctx->pos;
diff --git a/drivers/staging/lustre/lustre/llite/llite_internal.h b/drivers/staging/lustre/lustre/llite/llite_internal.h
index 3d7fa9a..43269aa 100644
--- a/drivers/staging/lustre/lustre/llite/llite_internal.h
+++ b/drivers/staging/lustre/lustre/llite/llite_internal.h
@@ -812,6 +812,7 @@ __u32 get_uuid2int(const char *name, int len);
void get_uuid2fsid(const char *name, int len, __kernel_fsid_t *fsid);
struct inode *search_inode_for_lustre(struct super_block *sb,
const struct lu_fid *fid);
+int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid);

/* llite/symlink.c */
extern const struct inode_operations ll_fast_symlink_inode_operations;
diff --git a/drivers/staging/lustre/lustre/llite/llite_nfs.c b/drivers/staging/lustre/lustre/llite/llite_nfs.c
index ab9d5cc..06a8199 100644
--- a/drivers/staging/lustre/lustre/llite/llite_nfs.c
+++ b/drivers/staging/lustre/lustre/llite/llite_nfs.c
@@ -302,14 +302,12 @@ static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
}

-static struct dentry *ll_get_parent(struct dentry *dchild)
+int ll_dir_get_parent_fid(struct inode *dir, struct lu_fid *parent_fid)
{
struct ptlrpc_request *req = NULL;
- struct inode *dir = d_inode(dchild);
struct ll_sb_info *sbi;
- struct dentry *result = NULL;
struct mdt_body *body;
- static char dotdot[] = "..";
+ static const char dotdot[] = "..";
struct md_op_data *op_data;
int rc;
int lmmsize;
@@ -324,13 +322,13 @@ static struct dentry *ll_get_parent(struct dentry *dchild)

rc = ll_get_default_mdsize(sbi, &lmmsize);
if (rc != 0)
- return ERR_PTR(rc);
+ return rc;

op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
strlen(dotdot), lmmsize,
LUSTRE_OPC_ANY, NULL);
if (IS_ERR(op_data))
- return (void *)op_data;
+ return PTR_ERR(op_data);

rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
ll_finish_md_op_data(op_data);
@@ -338,7 +336,7 @@ static struct dentry *ll_get_parent(struct dentry *dchild)
CERROR("%s: failure inode "DFID" get parent: rc = %d\n",
ll_get_fsname(dir->i_sb, NULL, 0),
PFID(ll_inode2fid(dir)), rc);
- return ERR_PTR(rc);
+ return rc;
}
body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
/*
@@ -348,11 +346,26 @@ static struct dentry *ll_get_parent(struct dentry *dchild)
if (body->valid & OBD_MD_FLID) {
CDEBUG(D_INFO, "parent for " DFID " is " DFID "\n",
PFID(ll_inode2fid(dir)), PFID(&body->fid1));
+ *parent_fid = body->fid1;
}
- result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);

ptlrpc_req_finished(req);
- return result;
+ return 0;
+}
+
+static struct dentry *ll_get_parent(struct dentry *dchild)
+{
+ struct lu_fid parent_fid = { 0 };
+ struct dentry *dentry;
+ int rc;
+
+ rc = ll_dir_get_parent_fid(dchild->d_inode, &parent_fid);
+ if (rc)
+ return ERR_PTR(rc);
+
+ dentry = ll_iget_for_nfs(dchild->d_inode->i_sb, &parent_fid, NULL);
+
+ return dentry;
}

const struct export_operations lustre_export_operations = {
--
1.7.1
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