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authorSage Weil <sage@newdream.net>2012-04-05 12:07:36 -0700
committerAl Viro <viro@zeniv.linux.org.uk>2012-05-29 23:28:33 -0400
commitc862868bb455694704c255481369c40d7185eb25 (patch)
tree6b0f0c0a9b252e1f526742bf7cb777b47320e49a /fs/ceph
parentb0b0382bb4904965a9e9fca77ad87514dfda0d1c (diff)
ceph: move encode_fh to new API
Use parent_inode has a flag for whether nfsd wants a connectable fh, but generate one opportunistically so that we can take advantage of the additional info in there. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/export.c34
1 files changed, 21 insertions, 13 deletions
diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index 4f9234c6da6..8e1b60e557b 100644
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -40,38 +40,49 @@ struct ceph_nfs_confh {
u32 parent_name_hash;
} __attribute__ ((packed));
-static int ceph_encode_fh(struct dentry *dentry, u32 *rawfh, int *max_len,
- int connectable)
+/*
+ * The presence of @parent_inode here tells us whether NFS wants a
+ * connectable file handle. However, we want to make a connectionable
+ * file handle unconditionally so that the MDS gets as much of a hint
+ * as possible. That means we only use @parent_dentry to indicate
+ * whether nfsd wants a connectable fh, and whether we should indicate
+ * failure from a too-small @max_len.
+ */
+static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
+ struct inode *parent_inode)
{
int type;
struct ceph_nfs_fh *fh = (void *)rawfh;
struct ceph_nfs_confh *cfh = (void *)rawfh;
- struct dentry *parent;
- struct inode *inode = dentry->d_inode;
int connected_handle_length = sizeof(*cfh)/4;
int handle_length = sizeof(*fh)/4;
+ struct dentry *dentry = d_find_alias(inode);
+ struct dentry *parent;
/* don't re-export snaps */
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EINVAL;
- spin_lock(&dentry->d_lock);
- parent = dentry->d_parent;
- if (*max_len >= connected_handle_length) {
+ /* if we found an alias, generate a connectable fh */
+ if (*max_len >= connected_handle_length && dentry) {
dout("encode_fh %p connectable\n", dentry);
- cfh->ino = ceph_ino(dentry->d_inode);
+ spin_lock(&dentry->d_lock);
+ parent = dentry->d_parent;
+ cfh->ino = ceph_ino(inode);
cfh->parent_ino = ceph_ino(parent->d_inode);
cfh->parent_name_hash = ceph_dentry_hash(parent->d_inode,
dentry);
*max_len = connected_handle_length;
type = 2;
+ spin_unlock(&dentry->d_lock);
} else if (*max_len >= handle_length) {
- if (connectable) {
+ if (parent_inode) {
+ /* nfsd wants connectable */
*max_len = connected_handle_length;
type = 255;
} else {
dout("encode_fh %p\n", dentry);
- fh->ino = ceph_ino(dentry->d_inode);
+ fh->ino = ceph_ino(inode);
*max_len = handle_length;
type = 1;
}
@@ -79,7 +90,6 @@ static int ceph_encode_fh(struct dentry *dentry, u32 *rawfh, int *max_len,
*max_len = handle_length;
type = 255;
}
- spin_unlock(&dentry->d_lock);
return type;
}
@@ -247,9 +257,7 @@ static struct dentry *ceph_fh_to_parent(struct super_block *sb,
}
const struct export_operations ceph_export_ops = {
-#ifdef CEPH_BREAKAGE_FIXED
.encode_fh = ceph_encode_fh,
-#endif
.fh_to_dentry = ceph_fh_to_dentry,
.fh_to_parent = ceph_fh_to_parent,
};