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-rw-r--r--fs/exofs/dir.c15
-rw-r--r--fs/exofs/exofs.h1
-rw-r--r--fs/exofs/super.c53
3 files changed, 69 insertions, 0 deletions
diff --git a/fs/exofs/dir.c b/fs/exofs/dir.c
index 6865605..65b0c8c 100644
--- a/fs/exofs/dir.c
+++ b/fs/exofs/dir.c
@@ -381,6 +381,21 @@ struct exofs_dir_entry *exofs_dotdot(struct inode *dir, struct page **p)
return de;
}
+ino_t exofs_parent_ino(struct dentry *child)
+{
+ struct page *page;
+ struct exofs_dir_entry *de;
+ ino_t ino;
+
+ de = exofs_dotdot(child->d_inode, &page);
+ if (!de)
+ return 0;
+
+ ino = le64_to_cpu(de->inode_no);
+ exofs_put_page(page);
+ return ino;
+}
+
ino_t exofs_inode_by_name(struct inode *dir, struct dentry *dentry)
{
ino_t res = 0;
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 11e11d5..0fd4c785 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -152,6 +152,7 @@ struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
struct page **);
int exofs_empty_dir(struct inode *);
struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
+ino_t exofs_parent_ino(struct dentry *child);
int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
struct inode *);
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index b736b11..9f1985e 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -37,6 +37,7 @@
#include <linux/parser.h>
#include <linux/vfs.h>
#include <linux/random.h>
+#include <linux/exportfs.h>
#include "exofs.h"
@@ -194,6 +195,7 @@ static void destroy_inodecache(void)
* SUPERBLOCK FUNCTIONS
*****************************************************************************/
static const struct super_operations exofs_sops;
+static const struct export_operations exofs_export_ops;
/*
* Write the superblock to the OSD
@@ -358,6 +360,7 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
/* set up operation vectors */
sb->s_op = &exofs_sops;
+ sb->s_export_op = &exofs_export_ops;
root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
if (IS_ERR(root)) {
EXOFS_ERR("ERROR: exofs_iget failed\n");
@@ -485,6 +488,56 @@ static const struct super_operations exofs_sops = {
};
/******************************************************************************
+ * EXPORT OPERATIONS
+ *****************************************************************************/
+
+struct dentry *exofs_get_parent(struct dentry *child)
+{
+ unsigned long ino = exofs_parent_ino(child);
+
+ if (!ino)
+ return NULL;
+
+ return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
+}
+
+static struct inode *exofs_nfs_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
+{
+ struct inode *inode;
+
+ inode = exofs_iget(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (generation && inode->i_generation != generation) {
+ /* we didn't find the right inode.. */
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+ return inode;
+}
+
+static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ exofs_nfs_get_inode);
+}
+
+static struct dentry *exofs_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ exofs_nfs_get_inode);
+}
+
+static const struct export_operations exofs_export_ops = {
+ .fh_to_dentry = exofs_fh_to_dentry,
+ .fh_to_parent = exofs_fh_to_parent,
+ .get_parent = exofs_get_parent,
+};
+
+/******************************************************************************
* INSMOD/RMMOD
*****************************************************************************/
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