#include "super.h"
#include "mds_client.h"
-/*
- * NFS export support
- *
- * NFS re-export of a ceph mount is, at present, only semireliable.
- * The basic issue is that the Ceph architectures doesn't lend itself
- * well to generating filehandles that will remain valid forever.
- *
- * So, we do our best. If you're lucky, your inode will be in the
- * client's cache. If it's not, and you have a connectable fh, then
- * the MDS server may be able to find it for you. Otherwise, you get
- * ESTALE.
- *
- * There are ways to this more reliable, but in the non-connectable fh
- * case, we won't every work perfectly, and in the connectable case,
- * some changes are needed on the MDS side to work better.
- */
-
/*
* Basic fh
*/
} __attribute__ ((packed));
/*
- * Larger 'connectable' fh that includes parent ino and name hash.
- * Use this whenever possible, as it works more reliably.
+ * Larger fh that includes parent ino.
*/
struct ceph_nfs_confh {
u64 ino, parent_ino;
- u32 parent_name_hash;
} __attribute__ ((packed));
-/*
- * 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)
{
struct ceph_nfs_confh *cfh = (void *)rawfh;
int connected_handle_length = sizeof(*cfh)/4;
int handle_length = sizeof(*fh)/4;
- struct dentry *dentry;
- struct dentry *parent;
/* don't re-export snaps */
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EINVAL;
- dentry = d_find_alias(inode);
+ if (parent_inode && (*max_len < connected_handle_length)) {
+ *max_len = connected_handle_length;
+ return FILEID_INVALID;
+ } else if (*max_len < handle_length) {
+ *max_len = handle_length;
+ return FILEID_INVALID;
+ }
- /* if we found an alias, generate a connectable fh */
- if (*max_len >= connected_handle_length && dentry) {
- dout("encode_fh %p connectable\n", dentry);
- spin_lock(&dentry->d_lock);
- parent = dentry->d_parent;
+ if (parent_inode) {
+ dout("encode_fh %llx with parent %llx\n",
+ ceph_ino(inode), ceph_ino(parent_inode));
cfh->ino = ceph_ino(inode);
- cfh->parent_ino = ceph_ino(parent->d_inode);
- cfh->parent_name_hash = ceph_dentry_hash(parent->d_inode,
- dentry);
+ cfh->parent_ino = ceph_ino(parent_inode);
*max_len = connected_handle_length;
- type = 2;
- spin_unlock(&dentry->d_lock);
- } else if (*max_len >= handle_length) {
- if (parent_inode) {
- /* nfsd wants connectable */
- *max_len = connected_handle_length;
- type = FILEID_INVALID;
- } else {
- dout("encode_fh %p\n", dentry);
- fh->ino = ceph_ino(inode);
- *max_len = handle_length;
- type = 1;
- }
+ type = FILEID_INO32_GEN_PARENT;
} else {
+ dout("encode_fh %llx\n", ceph_ino(inode));
+ fh->ino = ceph_ino(inode);
*max_len = handle_length;
- type = FILEID_INVALID;
+ type = FILEID_INO32_GEN;
}
- if (dentry)
- dput(dentry);
return type;
}
-/*
- * convert regular fh to dentry
- *
- * FIXME: we should try harder by querying the mds for the ino.
- */
-static struct dentry *__fh_to_dentry(struct super_block *sb,
- struct ceph_nfs_fh *fh, int fh_len)
+static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
{
struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
struct inode *inode;
struct ceph_vino vino;
int err;
- if (fh_len < sizeof(*fh) / 4)
- return ERR_PTR(-ESTALE);
-
- dout("__fh_to_dentry %llx\n", fh->ino);
- vino.ino = fh->ino;
+ vino.ino = ino;
vino.snap = CEPH_NOSNAP;
inode = ceph_find_inode(sb, vino);
if (!inode) {
dentry = d_obtain_alias(inode);
if (IS_ERR(dentry)) {
- pr_err("fh_to_dentry %llx -- inode %p but ENOMEM\n",
- fh->ino, inode);
iput(inode);
return dentry;
}
err = ceph_init_dentry(dentry);
if (err < 0) {
- iput(inode);
+ dput(dentry);
return ERR_PTR(err);
}
- dout("__fh_to_dentry %llx %p dentry %p\n", fh->ino, inode, dentry);
+ dout("__fh_to_dentry %llx %p dentry %p\n", ino, inode, dentry);
return dentry;
}
/*
- * convert connectable fh to dentry
+ * convert regular fh to dentry
*/
-static struct dentry *__cfh_to_dentry(struct super_block *sb,
- struct ceph_nfs_confh *cfh, int fh_len)
+static struct dentry *ceph_fh_to_dentry(struct super_block *sb,
+ struct fid *fid,
+ int fh_len, int fh_type)
{
- struct ceph_mds_client *mdsc = ceph_sb_to_client(sb)->mdsc;
- struct inode *inode;
- struct dentry *dentry;
- struct ceph_vino vino;
- int err;
-
- if (fh_len < sizeof(*cfh) / 4)
- return ERR_PTR(-ESTALE);
-
- dout("__cfh_to_dentry %llx (%llx/%x)\n",
- cfh->ino, cfh->parent_ino, cfh->parent_name_hash);
-
- vino.ino = cfh->ino;
- vino.snap = CEPH_NOSNAP;
- inode = ceph_find_inode(sb, vino);
- if (!inode) {
- struct ceph_mds_request *req;
-
- req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPHASH,
- USE_ANY_MDS);
- if (IS_ERR(req))
- return ERR_CAST(req);
-
- req->r_ino1 = vino;
- req->r_ino2.ino = cfh->parent_ino;
- req->r_ino2.snap = CEPH_NOSNAP;
- req->r_path2 = kmalloc(16, GFP_NOFS);
- snprintf(req->r_path2, 16, "%d", cfh->parent_name_hash);
- req->r_num_caps = 1;
- err = ceph_mdsc_do_request(mdsc, NULL, req);
- inode = req->r_target_inode;
- if (inode)
- ihold(inode);
- ceph_mdsc_put_request(req);
- if (!inode)
- return ERR_PTR(err ? err : -ESTALE);
- }
+ struct ceph_nfs_fh *fh = (void *)fid->raw;
- dentry = d_obtain_alias(inode);
- if (IS_ERR(dentry)) {
- pr_err("cfh_to_dentry %llx -- inode %p but ENOMEM\n",
- cfh->ino, inode);
- iput(inode);
- return dentry;
- }
- err = ceph_init_dentry(dentry);
- if (err < 0) {
- iput(inode);
- return ERR_PTR(err);
- }
- dout("__cfh_to_dentry %llx %p dentry %p\n", cfh->ino, inode, dentry);
- return dentry;
-}
+ if (fh_type != FILEID_INO32_GEN &&
+ fh_type != FILEID_INO32_GEN_PARENT)
+ return NULL;
+ if (fh_len < sizeof(*fh) / 4)
+ return NULL;
-static struct dentry *ceph_fh_to_dentry(struct super_block *sb, struct fid *fid,
- int fh_len, int fh_type)
-{
- if (fh_type == 1)
- return __fh_to_dentry(sb, (struct ceph_nfs_fh *)fid->raw,
- fh_len);
- else
- return __cfh_to_dentry(sb, (struct ceph_nfs_confh *)fid->raw,
- fh_len);
+ dout("fh_to_dentry %llx\n", fh->ino);
+ return __fh_to_dentry(sb, fh->ino);
}
/*
git.openpandora.org / pandora-kernel.git / commitdiff