afs: Increase to 64-bit volume ID and 96-bit vnode ID for YFS

Increase the sizes of the volume ID to 64 bits and the vnode ID (inode
number equivalent) to 96 bits to allow the support of YFS.

This requires the iget comparator to check the vnode->fid rather than i_ino
and i_generation as i_ino is not sufficiently capacious.  It also requires
this data to be placed into the vnode cache key for fscache.

For the moment, just discard the top 32 bits of the vnode ID when returning
it though stat.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 17 insertions, 14 deletions

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index ab4e7a15c205..4ba47efe9668 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -100,7 +100,7 @@ int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool new_inode)
 	struct afs_fs_cursor fc;
 	int ret;
 
-	_enter("%s,{%x:%u.%u,S=%lx}",
+	_enter("%s,{%llx:%llu.%u,S=%lx}",
 	       vnode->volume->name,
 	       vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
 	       vnode->flags);
@@ -127,9 +127,9 @@ int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool new_inode)
 int afs_iget5_test(struct inode *inode, void *opaque)
 {
 	struct afs_iget_data *data = opaque;
+	struct afs_vnode *vnode = AFS_FS_I(inode);
 
-	return inode->i_ino == data->fid.vnode &&
-		inode->i_generation == data->fid.unique;
+	return memcmp(&vnode->fid, &data->fid, sizeof(data->fid)) == 0;
 }
 
 /*
@@ -150,11 +150,14 @@ static int afs_iget5_set(struct inode *inode, void *opaque)
 	struct afs_iget_data *data = opaque;
 	struct afs_vnode *vnode = AFS_FS_I(inode);
 
-	inode->i_ino = data->fid.vnode;
-	inode->i_generation = data->fid.unique;
 	vnode->fid = data->fid;
 	vnode->volume = data->volume;
 
+	/* YFS supports 96-bit vnode IDs, but Linux only supports
+	 * 64-bit inode numbers.
+	 */
+	inode->i_ino = data->fid.vnode;
+	inode->i_generation = data->fid.unique;
 	return 0;
 }
 
@@ -193,7 +196,7 @@ struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
 		return ERR_PTR(-ENOMEM);
 	}
 
-	_debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }",
+	_debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
 	       inode, inode->i_ino, data.fid.vid, data.fid.vnode,
 	       data.fid.unique);
 
@@ -252,8 +255,8 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
 
 	key.vnode_id		= vnode->fid.vnode;
 	key.unique		= vnode->fid.unique;
-	key.vnode_id_ext[0]	= 0;
-	key.vnode_id_ext[1]	= 0;
+	key.vnode_id_ext[0]	= vnode->fid.vnode >> 32;
+	key.vnode_id_ext[1]	= vnode->fid.vnode_hi;
 	aux.data_version	= vnode->status.data_version;
 
 	vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
@@ -277,7 +280,7 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
 	struct inode *inode;
 	int ret;
 
-	_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
+	_enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);
 
 	as = sb->s_fs_info;
 	data.volume = as->volume;
@@ -289,7 +292,7 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
 		return ERR_PTR(-ENOMEM);
 	}
 
-	_debug("GOT INODE %p { vl=%x vn=%x, u=%x }",
+	_debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
 	       inode, fid->vid, fid->vnode, fid->unique);
 
 	vnode = AFS_FS_I(inode);
@@ -352,7 +355,7 @@ bad_inode:
  */
 void afs_zap_data(struct afs_vnode *vnode)
 {
-	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
+	_enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
 
 #ifdef CONFIG_AFS_FSCACHE
 	fscache_invalidate(vnode->cache);
@@ -382,7 +385,7 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
 	bool valid = false;
 	int ret;
 
-	_enter("{v={%x:%u} fl=%lx},%x",
+	_enter("{v={%llx:%llu} fl=%lx},%x",
 	       vnode->fid.vid, vnode->fid.vnode, vnode->flags,
 	       key_serial(key));
 
@@ -501,7 +504,7 @@ void afs_evict_inode(struct inode *inode)
 
 	vnode = AFS_FS_I(inode);
 
-	_enter("{%x:%u.%d}",
+	_enter("{%llx:%llu.%d}",
 	       vnode->fid.vid,
 	       vnode->fid.vnode,
 	       vnode->fid.unique);
@@ -550,7 +553,7 @@ int afs_setattr(struct dentry *dentry, struct iattr *attr)
 	struct key *key;
 	int ret;
 
-	_enter("{%x:%u},{n=%pd},%x",
+	_enter("{%llx:%llu},{n=%pd},%x",
 	       vnode->fid.vid, vnode->fid.vnode, dentry,
 	       attr->ia_valid);