The patch titled
hfs+: add basic export support
has been added to the -mm tree. Its filename is
hfs-add-basic-export-support.patch
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------------------------------------------------------
Subject: hfs+: add basic export support
From: "Diego Elio 'Flameeyes' Pettenò" <flameeyes@xxxxxxxxx>
The function's 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 Elio 'Flameeyes' Pettenò" <flameeyes@xxxxxxxxx>
Cc: Roman Zippel <zippel@xxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/hfsplus/super.c | 49 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff -puN fs/hfsplus/super.c~hfs-add-basic-export-support fs/hfsplus/super.c
--- a/fs/hfsplus/super.c~hfs-add-basic-export-support
+++ a/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>
@@ -287,6 +288,53 @@ static const struct super_operations hfs
.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;
@@ -351,6 +399,7 @@ static int hfsplus_fill_super(struct sup
/* 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))) {
_
Patches currently in -mm which might be from flameeyes@xxxxxxxxx are
hfs-add-basic-export-support.patch
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