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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>
This commit is contained in:
Sage Weil 2012-04-05 12:07:36 -07:00 committed by Al Viro
parent b0b0382bb4
commit c862868bb4
1 changed files with 21 additions and 13 deletions
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34
fs/ceph/export.c
View File

@ -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,
};