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Subject[PATCH] Add basic export support to HFS+.
Date
From: Diego E. 'Flameeyes' Pettenò <flameeyes@gmail.com>

The functions' skeleton is taken from ext2/super.c and seems to work
fine for R/W access to HFS+ non-journaled case-sensitive filesystems.

It's probably slow and has a lot of space for improvement but it's
still better than having no hope to export HFS+ filesystems.

Signed-off-by: Diego E. 'Flameeyes' Pettenò <flameeyes@gmail.com>
---

fs/hfsplus/super.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index eb74531..45b48cc 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -11,6 +11,7 @@
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/fs.h>
+#include <linux/exportfs.h>
#include <linux/slab.h>
#include <linux/vfs.h>
#include <linux/nls.h>
@@ -281,6 +282,53 @@ static const struct super_operations hfsplus_sops = {
.show_options = hfsplus_show_options,
};

+static struct inode *hfsplus_export_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
+{
+ struct inode *inode;
+
+ if (ino < HFSPLUS_FIRSTUSER_CNID && ino != HFSPLUS_ROOT_CNID)
+ return ERR_PTR(-ESTALE);
+
+ /* iget isn't really right if the inode is currently unallocated!!
+ */
+ inode = hfsplus_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 *hfsplus_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,
+ hfsplus_export_get_inode);
+}
+
+static struct dentry *hfsplus_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,
+ hfsplus_export_get_inode);
+}
+
+/* Yes, most of these are left as NULL!!
+ * A NULL value implies the default, which (hopefully) works with
+ * hfs+-like file systems, but can be improved upon.
+ * Currently only fh_to_dentry is required.
+ */
+static const struct export_operations hfsplus_export_ops = {
+ .fh_to_dentry = hfsplus_fh_to_dentry,
+ .fh_to_parent = hfsplus_fh_to_parent,
+};
+
static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
{
struct hfsplus_vh *vhdr;
@@ -345,6 +393,7 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)

/* Set up operations so we can load metadata */
sb->s_op = &hfsplus_sops;
+ sb->s_export_op = &hfsplus_export_ops;
sb->s_maxbytes = MAX_LFS_FILESIZE;

if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
--
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