/*
* Dangling inodes can occur if processes are holding open descriptors on
* deleted files as-of when a machine crashes. When we find one simply
* acquire the inode and release it. The inode handling code will then
* do the right thing.
*/
static
void
prune_check_nlinks(hammer_cursor_t cursor, hammer_btree_leaf_elm_t elm)
{
hammer_inode_t ip;
int error;
if (elm->base.rec_type != HAMMER_RECTYPE_INODE)
return;
if (elm->base.delete_tid != 0)
return;
if (hammer_btree_extract(cursor, HAMMER_CURSOR_GET_DATA))
return;
if (cursor->data->inode.nlinks)
return;
hammer_cursor_downgrade(cursor);
ip = hammer_get_inode(cursor->trans, NULL, elm->base.obj_id,
HAMMER_MAX_TID,
elm->base.localization & HAMMER_LOCALIZE_PSEUDOFS_MASK,
0, &error);
if (ip) {
if (hammer_debug_general & 0x0001) {
kprintf("pruning disconnected inode %016llx\n",
(long long)elm->base.obj_id);
}
hammer_rel_inode(ip, 0);
hammer_inode_waitreclaims(cursor->trans);
} else {
kprintf("unable to prune disconnected inode %016llx\n",
(long long)elm->base.obj_id);
}
}
// corresponds to hammer_vfs_vget
struct inode *hammerfs_iget(struct super_block *sb, ino_t ino)
{
struct hammer_transaction trans;
struct hammer_mount *hmp = (void*)sb->s_fs_info;
struct hammer_inode *ip;
struct inode *inode;
int error = 0;
hammer_simple_transaction(&trans, hmp);
/*
* 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, HAMMER_DEF_LOCALIZATION,
0, &error);
if (ip == NULL) {
hammer_done_transaction(&trans);
goto failed;
}
error = hammerfs_get_inode(sb, ip, &inode);
// hammer_rel_inode(ip, 0);
hammer_done_transaction(&trans);
return inode;
failed:
iget_failed(inode);
return ERR_PTR(error);
}
/*
* Iterate PFS ondisk data.
* This function essentially does the same as hammer_load_pseudofs()
* except that this function only retrieves PFS data without touching
* hammer_pfs_rb_tree at all.
*
* NOTE: The ip used for ioctl is not necessarily related to the PFS
* since this ioctl only requires PFS id (or upper 16 bits of ip localization).
*
* NOTE: The API was changed in DragonFly 4.7, due to design issues
* this ioctl and libhammer (which is the only caller of this ioctl
* within DragonFly source, but no longer maintained by anyone) had.
*/
int
hammer_ioc_scan_pseudofs(hammer_transaction_t trans, hammer_inode_t ip,
struct hammer_ioc_pseudofs_rw *pfs)
{
struct hammer_cursor cursor;
hammer_inode_t dip;
uint32_t localization;
int error;
if ((error = hammer_pfs_autodetect(pfs, ip)) != 0)
return(error);
localization = pfs_to_lo(pfs->pfs_id);
pfs->bytes = sizeof(struct hammer_pseudofs_data);
pfs->version = HAMMER_IOC_PSEUDOFS_VERSION;
dip = hammer_get_inode(trans, NULL, HAMMER_OBJID_ROOT, HAMMER_MAX_TID,
HAMMER_DEF_LOCALIZATION, 0, &error);
error = hammer_init_cursor(trans, &cursor,
(dip ? &dip->cache[1] : NULL), dip);
if (error)
goto fail;
cursor.key_beg.localization = HAMMER_DEF_LOCALIZATION |
HAMMER_LOCALIZE_MISC;
cursor.key_beg.obj_id = HAMMER_OBJID_ROOT;
cursor.key_beg.create_tid = 0;
cursor.key_beg.delete_tid = 0;
cursor.key_beg.rec_type = HAMMER_RECTYPE_PFS;
cursor.key_beg.obj_type = 0;
cursor.key_beg.key = localization;
cursor.asof = HAMMER_MAX_TID;
cursor.flags |= HAMMER_CURSOR_ASOF;
error = hammer_ip_lookup(&cursor);
if (error == 0) {
error = hammer_ip_resolve_data(&cursor);
if (error == 0) {
if (pfs->ondisk)
copyout(cursor.data, pfs->ondisk, cursor.leaf->data_len);
localization = cursor.leaf->base.key;
pfs->pfs_id = lo_to_pfs(localization);
}
}
hammer_done_cursor(&cursor);
fail:
if (dip)
hammer_rel_inode(dip, 0);
return(error);
}
/*
* 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);
}
/* corresponds to hammer_vop_nresolve */
struct dentry *hammerfs_inode_lookup(struct inode *parent_inode,
struct dentry *dentry,
struct nameidata *nameidata)
{
struct hammer_transaction trans;
struct super_block *sb;
struct inode *inode;
hammer_inode_t dip;
hammer_inode_t ip;
hammer_tid_t asof;
struct hammer_cursor cursor;
int64_t namekey;
u_int32_t max_iterations;
int64_t obj_id;
int nlen;
int flags;
int error;
u_int32_t localization;
printk(KERN_INFO "hammerfs_inode_lookup(parent_inode->i_ino=%lu, dentry->d_name.name=%s)\n",
parent_inode->i_ino, dentry->d_name.name);
sb = parent_inode->i_sb;
dip = (hammer_inode_t)parent_inode->i_private;
asof = dip->obj_asof;
localization = dip->obj_localization; /* for code consistency */
nlen = dentry->d_name.len;
flags = dip->flags & HAMMER_INODE_RO;
hammer_simple_transaction(&trans, dip->hmp);
/*
* Calculate the namekey and setup the key range for the scan. This
* works kinda like a chained hash table where the lower 32 bits
* of the namekey synthesize the chain.
*
* The key range is inclusive of both key_beg and key_end.
*/
namekey = hammer_directory_namekey(dip, dentry->d_name.name, nlen,
&max_iterations);
error = hammer_init_cursor(&trans, &cursor, &dip->cache[1], dip);
cursor.key_beg.localization = dip->obj_localization +
HAMMER_LOCALIZE_MISC;
cursor.key_beg.obj_id = dip->obj_id;
cursor.key_beg.key = namekey;
cursor.key_beg.create_tid = 0;
cursor.key_beg.delete_tid = 0;
cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
cursor.key_beg.obj_type = 0;
cursor.key_end = cursor.key_beg;
cursor.key_end.key += max_iterations;
cursor.asof = asof;
cursor.flags |= HAMMER_CURSOR_END_INCLUSIVE | HAMMER_CURSOR_ASOF;
/*
* Scan all matching records (the chain), locate the one matching
* the requested path component.
*
* The hammer_ip_*() functions merge in-memory records with on-disk
* records for the purposes of the search.
*/
obj_id = 0;
localization = HAMMER_DEF_LOCALIZATION;
if (error == 0) {
error = hammer_ip_first(&cursor);
while (error == 0) {
error = hammer_ip_resolve_data(&cursor);
if (error)
break;
if (nlen == cursor.leaf->data_len -
HAMMER_ENTRY_NAME_OFF &&
bcmp(dentry->d_name.name,
cursor.data->entry.name, nlen) == 0) {
obj_id = cursor.data->entry.obj_id;
localization = cursor.data->entry.localization;
break;
}
error = hammer_ip_next(&cursor);
}
}
hammer_done_cursor(&cursor);
if (error == 0) {
ip = hammer_get_inode(&trans, dip, obj_id,
asof, localization,
flags, &error);
if (error == 0)
error = hammerfs_get_inode(sb, ip, &inode);
/* hammer_rel_inode(ip, 0); */
else
ip = NULL;
if (error == 0)
d_add(dentry, inode);
goto done;
}
done:
/*hammer_done_transaction(&trans);*/
return NULL;
}
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);
}