/*
* Obtain a vnode for the specified inode number. An exclusively locked
* vnode is returned.
*/
int
hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
ino_t ino, struct vnode **vpp)
{
struct hammer_transaction trans;
struct hammer_mount *hmp = (void *)mp->mnt_data;
struct hammer_inode *ip;
int error;
u_int32_t localization;
lwkt_gettoken(&hmp->fs_token);
hammer_simple_transaction(&trans, hmp);
/*
* If a directory vnode is supplied (mainly NFS) then we can acquire
* the PFS domain from it. Otherwise we would only be able to vget
* inodes in the root PFS.
*/
if (dvp) {
localization = HAMMER_DEF_LOCALIZATION +
VTOI(dvp)->obj_localization;
} else {
localization = HAMMER_DEF_LOCALIZATION;
}
/*
* Lookup the requested HAMMER inode. The structure must be
* left unlocked while we manipulate the related vnode to avoid
* a deadlock.
*/
ip = hammer_get_inode(&trans, NULL, ino,
hmp->asof, localization,
0, &error);
if (ip == NULL) {
*vpp = NULL;
} else {
error = hammer_get_vnode(ip, vpp);
hammer_rel_inode(ip, 0);
}
hammer_done_transaction(&trans);
lwkt_reltoken(&hmp->fs_token);
return (error);
}
/*
* Convert a file handle back to a vnode.
*
* Use rootvp to enforce PFS isolation when a PFS is exported via a
* null mount.
*/
static int
hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
struct fid *fhp, struct vnode **vpp)
{
hammer_mount_t hmp = (void *)mp->mnt_data;
struct hammer_transaction trans;
struct hammer_inode *ip;
struct hammer_inode_info info;
int error;
u_int32_t localization;
bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
if (rootvp)
localization = VTOI(rootvp)->obj_localization;
else
localization = (u_int32_t)fhp->fid_ext << 16;
lwkt_gettoken(&hmp->fs_token);
hammer_simple_transaction(&trans, hmp);
/*
* Get/allocate the hammer_inode structure. The structure must be
* unlocked while we manipulate the related vnode to avoid a
* deadlock.
*/
ip = hammer_get_inode(&trans, NULL, info.obj_id,
info.obj_asof, localization, 0, &error);
if (ip) {
error = hammer_get_vnode(ip, vpp);
hammer_rel_inode(ip, 0);
} else {
*vpp = NULL;
}
hammer_done_transaction(&trans);
lwkt_reltoken(&hmp->fs_token);
return (error);
}
static inline int
_vnode_validate(hammer_dedup_cache_t dcp, void *data, int *errorp)
{
struct hammer_transaction trans;
hammer_inode_t ip;
struct vnode *vp;
struct buf *bp;
/* off_t dooffset; */
int result, error;
result = error = 0;
*errorp = 0;
hammer_simple_transaction(&trans, dcp->hmp);
ip = hammer_get_inode(&trans, NULL, dcp->obj_id, HAMMER_MAX_TID,
dcp->localization, 0, &error);
if (ip == NULL) {
kprintf("dedup: unable to find objid %016llx:%08x\n",
(long long)dcp->obj_id, dcp->localization);
*errorp = 1;
goto failed2;
}
error = hammer_get_vnode(ip, &vp);
if (error) {
kprintf("dedup: unable to acquire vnode for %016llx:%08x\n",
(long long)dcp->obj_id, dcp->localization);
*errorp = 2;
goto failed;
}
if ((bp = findblk(ip->vp, dcp->file_offset, FINDBLK_NBLOCK)) != NULL) {
dfly_brelse(bp); /* bremfree(bp) */
/* XXX if (mapped to userspace) goto done, *errorp = 4 */
if ((bp->b_flags & B_CACHE) == 0 || bp->b_flags & B_DIRTY) {
*errorp = 5;
goto done;
}
/* XXX if (bp->b_bio2.bio_offset != dcp->data_offset) {
error = VOP_BMAP(ip->vp, dcp->file_offset, &dooffset,
NULL, NULL, BUF_CMD_READ);
if (error) {
*errorp = 6;
goto done;
}
if (dooffset != dcp->data_offset) {
*errorp = 7;
goto done;
}
hammer_live_dedup_bmap_saves++;
}
*/
if (bcmp(data, bp->b_data, dcp->bytes) == 0)
result = 1;
done:
dfly_brelse(bp); /* XX free to buffer not kfree ... bqrelse(bp);*/
} else {
*errorp = 3;
}
vput(vp);
failed:
hammer_rel_inode(ip, 0);
failed2:
hammer_done_transaction(&trans);
return (result);
}
