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nilfs_subr.c
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/* $NetBSD: nilfs_subr.c,v 1.9 2012/12/20 08:03:43 hannken Exp $ */
/*
* Copyright (c) 2008, 2009 Reinoud Zandijk
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
#ifndef lint
__KERNEL_RCSID(0, "$NetBSD: nilfs_subr.c,v 1.9 2012/12/20 08:03:43 hannken Exp $");
#endif /* not lint */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h> /* defines plimit structure in proc struct */
#include <sys/kernel.h>
#include <sys/file.h> /* define FWRITE ... */
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/lockf.h>
#include <sys/kauth.h>
#include <sys/dirhash.h>
#include <miscfs/genfs/genfs.h>
#include <uvm/uvm_extern.h>
#include <fs/nilfs/nilfs_mount.h>
#include "nilfs.h"
#include "nilfs_subr.h"
#include "nilfs_bswap.h"
#define VTOI(vnode) ((struct nilfs_node *) (vnode)->v_data)
/* forwards */
static int nilfs_btree_lookup(struct nilfs_node *node, uint64_t lblocknr,
uint64_t *vblocknr);
/* basic calculators */
uint64_t nilfs_get_segnum_of_block(struct nilfs_device *nilfsdev,
uint64_t blocknr)
{
return blocknr / nilfs_rw32(nilfsdev->super.s_blocks_per_segment);
}
void
nilfs_get_segment_range(struct nilfs_device *nilfsdev, uint64_t segnum,
uint64_t *seg_start, uint64_t *seg_end)
{
uint64_t blks_per_seg;
blks_per_seg = nilfs_rw64(nilfsdev->super.s_blocks_per_segment);
*seg_start = blks_per_seg * segnum;
*seg_end = *seg_start + blks_per_seg -1;
if (segnum == 0)
*seg_start = nilfs_rw64(nilfsdev->super.s_first_data_block);
}
void nilfs_calc_mdt_consts(struct nilfs_device *nilfsdev,
struct nilfs_mdt *mdt, int entry_size)
{
uint32_t blocksize = nilfsdev->blocksize;
mdt->entries_per_group = blocksize * 8; /* bits in sector */
mdt->entries_per_block = blocksize / entry_size;
mdt->blocks_per_group =
(mdt->entries_per_group -1) / mdt->entries_per_block + 1 + 1;
mdt->groups_per_desc_block =
blocksize / sizeof(struct nilfs_block_group_desc);
mdt->blocks_per_desc_block =
mdt->groups_per_desc_block * mdt->blocks_per_group + 1;
}
/* from NetBSD's src/sys/net/if_ethersubr.c */
uint32_t
crc32_le(uint32_t crc, const uint8_t *buf, size_t len)
{
static const uint32_t crctab[] = {
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
};
size_t i;
for (i = 0; i < len; i++) {
crc ^= buf[i];
crc = (crc >> 4) ^ crctab[crc & 0xf];
crc = (crc >> 4) ^ crctab[crc & 0xf];
}
return (crc);
}
static int
nilfs_calchash(uint64_t ino)
{
return (int) ino;
}
/* dev reading */
static int
nilfs_dev_bread(struct nilfs_device *nilfsdev, uint64_t blocknr,
struct kauth_cred *cred, int flags, struct buf **bpp)
{
int blk2dev = nilfsdev->blocksize / DEV_BSIZE;
return bread(nilfsdev->devvp, blocknr * blk2dev, nilfsdev->blocksize,
NOCRED, 0, bpp);
}
/* read on a node */
int
nilfs_bread(struct nilfs_node *node, uint64_t blocknr,
struct kauth_cred *cred, int flags, struct buf **bpp)
{
uint64_t vblocknr;
int error;
error = nilfs_btree_lookup(node, blocknr, &vblocknr);
if (error)
return error;
return bread(node->vnode, vblocknr, node->nilfsdev->blocksize,
cred, flags, bpp);
}
/* segment-log reading */
int
nilfs_get_segment_log(struct nilfs_device *nilfsdev, uint64_t *blocknr,
uint64_t *offset, struct buf **bpp, int len, void *blob)
{
int blocksize = nilfsdev->blocksize;
int error;
KASSERT(len <= blocksize);
if (*offset + len > blocksize) {
*blocknr = *blocknr + 1;
*offset = 0;
}
if (*offset == 0) {
if (*bpp)
brelse(*bpp, BC_AGE);
/* read in block */
error = nilfs_dev_bread(nilfsdev, *blocknr, NOCRED, 0, bpp);
if (error)
return error;
}
memcpy(blob, ((uint8_t *) (*bpp)->b_data) + *offset, len);
*offset += len;
return 0;
}
/* -------------------------------------------------------------------------- */
/* btree operations */
static int
nilfs_btree_lookup_level(struct nilfs_node *node, uint64_t lblocknr,
uint64_t btree_vblknr, int level, uint64_t *vblocknr)
{
struct nilfs_device *nilfsdev = node->nilfsdev;
struct nilfs_btree_node *btree_hdr;
struct buf *bp;
uint64_t btree_blknr;
uint64_t *dkeys, *dptrs, child_btree_blk;
uint8_t *pos;
int i, error, selected;
DPRINTF(TRANSLATE, ("nilfs_btree_lookup_level ino %"PRIu64", "
"lblocknr %"PRIu64", btree_vblknr %"PRIu64", level %d\n",
node->ino, lblocknr, btree_vblknr, level));
/* translate btree_vblknr */
error = nilfs_nvtop(node, 1, &btree_vblknr, &btree_blknr);
if (error)
return error;
/* get our block */
error = nilfs_dev_bread(nilfsdev, btree_blknr, NOCRED, 0, &bp);
if (error) {
return error;
}
btree_hdr = (struct nilfs_btree_node *) bp->b_data;
pos = (uint8_t *) bp->b_data +
sizeof(struct nilfs_btree_node) +
NILFS_BTREE_NODE_EXTRA_PAD_SIZE;
dkeys = (uint64_t *) pos;
dptrs = dkeys + NILFS_BTREE_NODE_NCHILDREN_MAX(nilfsdev->blocksize);
assert((btree_hdr->bn_flags & NILFS_BTREE_NODE_ROOT) == 0);
/* select matching child XXX could use binary search */
selected = 0;
for (i = 0; i < nilfs_rw16(btree_hdr->bn_nchildren); i++) {
if (dkeys[i] > lblocknr)
break;
selected = i;
}
if (level == 1) {
/* if found it mapped */
if (dkeys[selected] == lblocknr)
*vblocknr = dptrs[selected];
brelse(bp, BC_AGE);
return 0;
}
/* lookup in selected child */
assert(dkeys[selected] <= lblocknr);
child_btree_blk = dptrs[selected];
brelse(bp, BC_AGE);
return nilfs_btree_lookup_level(node, lblocknr,
child_btree_blk, btree_hdr->bn_level-1, vblocknr);
}
/* internal function */
static int
nilfs_btree_lookup(struct nilfs_node *node, uint64_t lblocknr,
uint64_t *vblocknr)
{
struct nilfs_inode *inode = &node->inode;
struct nilfs_btree_node *btree_hdr;
uint64_t *dkeys, *dptrs, *dtrans;
int i, selected;
int error;
DPRINTF(TRANSLATE, ("nilfs_btree_lookup ino %"PRIu64", "
"lblocknr %"PRIu64"\n", node->ino, lblocknr));
btree_hdr = (struct nilfs_btree_node *) &inode->i_bmap[0];
dkeys = &inode->i_bmap[1];
dptrs = dkeys + NILFS_BTREE_ROOT_NCHILDREN_MAX;
dtrans = &inode->i_bmap[1];
/* SMALL, direct lookup */
*vblocknr = 0;
if ((btree_hdr->bn_flags & NILFS_BMAP_LARGE) == 0) {
if (lblocknr < NILFS_DIRECT_NBLOCKS) {
*vblocknr = dtrans[lblocknr];
return 0;
}
/* not mapped XXX could be considered error here */
return 0;
}
/* LARGE, select matching child; XXX could use binary search */
dtrans = NULL;
error = 0;
selected = 0;
for (i = 0; i < nilfs_rw16(btree_hdr->bn_nchildren); i++) {
if (dkeys[i] > lblocknr)
break;
selected = i;
}
/* if selected key > lblocknr, its not mapped */
if (dkeys[selected] > lblocknr)
return 0;
/* overshooting? then not mapped */
if (selected == nilfs_rw16(btree_hdr->bn_nchildren))
return 0;
/* level should be > 1 or otherwise it should be a direct one */
assert(btree_hdr->bn_level > 1);
/* lookup in selected child */
assert(dkeys[selected] <= lblocknr);
error = nilfs_btree_lookup_level(node, lblocknr,
dptrs[selected], btree_hdr->bn_level-1, vblocknr);
return error;
}
/* node should be locked on entry to prevent btree changes (unlikely) */
int
nilfs_btree_nlookup(struct nilfs_node *node, uint64_t from, uint64_t blks,
uint64_t *l2vmap)
{
uint64_t lblocknr, *vblocknr;
int i, error;
/* TODO / OPTI multiple translations in one go possible */
error = EINVAL;
for (i = 0; i < blks; i++) {
lblocknr = from + i;
vblocknr = l2vmap + i;
error = nilfs_btree_lookup(node, lblocknr, vblocknr);
DPRINTF(TRANSLATE, ("btree_nlookup ino %"PRIu64", "
"lblocknr %"PRIu64" -> %"PRIu64"\n",
node->ino, lblocknr, *vblocknr));
if (error)
break;
}
return error;
}
/* --------------------------------------------------------------------- */
/* vtop operations */
/* translate index to a file block number and an entry */
static void
nilfs_mdt_trans(struct nilfs_mdt *mdt, uint64_t index,
uint64_t *blocknr, uint32_t *entry_in_block)
{
uint64_t blknr;
uint64_t group, group_offset, blocknr_in_group;
uint64_t desc_block, desc_offset;
/* calculate our offset in the file */
group = index / mdt->entries_per_group;
group_offset = index % mdt->entries_per_group;
desc_block = group / mdt->groups_per_desc_block;
desc_offset = group % mdt->groups_per_desc_block;
blocknr_in_group = group_offset / mdt->entries_per_block;
/* to descgroup offset */
blknr = 1 + desc_block * mdt->blocks_per_desc_block;
/* to group offset */
blknr += desc_offset * mdt->blocks_per_group;
/* to actual file block */
blknr += 1 + blocknr_in_group;
*blocknr = blknr;
*entry_in_block = group_offset % mdt->entries_per_block;
}
static int
nilfs_vtop(struct nilfs_device *nilfsdev, uint64_t vblocknr, uint64_t *pblocknr)
{
struct nilfs_dat_entry *entry;
struct buf *bp;
uint64_t ldatblknr;
uint32_t entry_in_block;
int error;
nilfs_mdt_trans(&nilfsdev->dat_mdt, vblocknr,
&ldatblknr, &entry_in_block);
error = nilfs_bread(nilfsdev->dat_node, ldatblknr, NOCRED, 0, &bp);
if (error) {
printf("vtop: can't read in DAT block %"PRIu64"!\n", ldatblknr);
return error;
}
/* get our translation */
entry = ((struct nilfs_dat_entry *) bp->b_data) + entry_in_block;
#if 0
printf("\tvblk %4"PRIu64" -> %"PRIu64" for "
"checkpoint %"PRIu64" to %"PRIu64"\n",
vblocknr,
nilfs_rw64(entry->de_blocknr),
nilfs_rw64(entry->de_start),
nilfs_rw64(entry->de_end));
#endif
*pblocknr = nilfs_rw64(entry->de_blocknr);
brelse(bp, BC_AGE);
return 0;
}
int
nilfs_nvtop(struct nilfs_node *node, uint64_t blks, uint64_t *l2vmap,
uint64_t *v2pmap)
{
uint64_t vblocknr, *pblocknr;
int i, error;
/* the DAT inode is the only one not mapped virtual */
if (node->ino == NILFS_DAT_INO) {
memcpy(v2pmap, l2vmap, blks * sizeof(uint64_t));
return 0;
}
/* TODO / OPTI more translations in one go */
error = 0;
for (i = 0; i < blks; i++) {
vblocknr = l2vmap[i];
pblocknr = v2pmap + i;
*pblocknr = 0;
/* only translate valid vblocknrs */
if (vblocknr == 0)
continue;
error = nilfs_vtop(node->nilfsdev, vblocknr, pblocknr);
if (error)
break;
}
return error;
}
/* --------------------------------------------------------------------- */
struct nilfs_recover_info {
uint64_t segnum;
uint64_t pseg;
struct nilfs_segment_summary segsum;
struct nilfs_super_root super_root;
STAILQ_ENTRY(nilfs_recover_info) next;
};
/*
* Helper functions of nilfs_mount() that actually mounts the disc.
*/
static int
nilfs_load_segsum(struct nilfs_device *nilfsdev,
struct nilfs_recover_info *ri)
{
struct buf *bp;
uint64_t blocknr, offset;
uint32_t segsum_struct_size;
uint32_t magic;
int error;
segsum_struct_size = sizeof(struct nilfs_segment_summary);
/* read in segsum structure */
bp = NULL;
blocknr = ri->pseg;
offset = 0;
error = nilfs_get_segment_log(nilfsdev,
&blocknr, &offset, &bp,
segsum_struct_size, (void *) &ri->segsum);
if (error)
goto out;
/* sanity checks */
magic = nilfs_rw32(ri->segsum.ss_magic);
if (magic != NILFS_SEGSUM_MAGIC) {
DPRINTF(VOLUMES, ("nilfs: bad magic in pseg %"PRIu64"\n",
ri->pseg));
error = EINVAL;
goto out;
}
/* TODO check segment summary checksum */
/* TODO check data checksum */
out:
if (bp)
brelse(bp, BC_AGE);
return error;
}
static int
nilfs_load_super_root(struct nilfs_device *nilfsdev,
struct nilfs_recover_info *ri)
{
struct nilfs_segment_summary *segsum = &ri->segsum;
struct nilfs_super_root *super_root;
struct buf *bp;
uint64_t blocknr, offset;
uint32_t segsum_size, size;
uint32_t nsumblk, nfileblk;
uint32_t super_root_crc, comp_crc;
int off, error;
/* process segment summary */
segsum_size = nilfs_rw32(segsum->ss_sumbytes);
nsumblk = (segsum_size - 1) / nilfsdev->blocksize + 1;
nfileblk = nilfs_rw32(segsum->ss_nblocks) - nsumblk;
/* check if there is a superroot */
if ((nilfs_rw16(segsum->ss_flags) & NILFS_SS_SR) == 0) {
DPRINTF(VOLUMES, ("nilfs: no super root in pseg %"PRIu64"\n",
ri->pseg));
return ENOENT;
}
/* get our super root, located at the end of the pseg */
blocknr = ri->pseg + nsumblk + nfileblk - 1;
offset = 0;
size = sizeof(struct nilfs_super_root);
bp = NULL;
error = nilfs_get_segment_log(nilfsdev,
&blocknr, &offset, &bp,
size, (void *) &nilfsdev->super_root);
if (bp)
brelse(bp, BC_AGE);
if (error) {
printf("read in of superroot failed\n");
return EIO;
}
/* check super root crc */
super_root = &nilfsdev->super_root;
super_root_crc = nilfs_rw32(super_root->sr_sum);
off = sizeof(super_root->sr_sum);
comp_crc = crc32_le(nilfs_rw32(nilfsdev->super.s_crc_seed),
(uint8_t *) super_root + off,
NILFS_SR_BYTES - off);
if (super_root_crc != comp_crc) {
DPRINTF(VOLUMES, (" invalid superroot, likely from old format\n"));
return EINVAL;
}
DPRINTF(VOLUMES, (" got valid superroot\n"));
return 0;
}
/*
* Search for the last super root recorded.
*/
void
nilfs_search_super_root(struct nilfs_device *nilfsdev)
{
struct nilfs_super_block *super;
struct nilfs_segment_summary *segsum;
struct nilfs_recover_info *ri, *ori, *i_ri;
STAILQ_HEAD(,nilfs_recover_info) ri_list;
uint64_t seg_start, seg_end, cno;
uint32_t segsum_size;
uint32_t nsumblk, nfileblk;
int error;
STAILQ_INIT(&ri_list);
/* search for last super root */
ri = malloc(sizeof(struct nilfs_recover_info), M_NILFSTEMP, M_WAITOK);
memset(ri, 0, sizeof(struct nilfs_recover_info));
/* if enabled, start from the specified position */
if (0) {
/* start from set start */
nilfsdev->super.s_last_pseg = nilfsdev->super.s_first_data_block;
nilfsdev->super.s_last_cno = nilfs_rw64(1);
}
ri->pseg = nilfs_rw64(nilfsdev->super.s_last_pseg); /* blknr */
ri->segnum = nilfs_get_segnum_of_block(nilfsdev, ri->pseg);
error = 0;
cno = nilfs_rw64(nilfsdev->super.s_last_cno);
DPRINTF(VOLUMES, ("nilfs: seach_super_root start in pseg %"PRIu64"\n",
ri->pseg));
for (;;) {
DPRINTF(VOLUMES, (" at pseg %"PRIu64"\n", ri->pseg));
error = nilfs_load_segsum(nilfsdev, ri);
if (error)
break;
segsum = &ri->segsum;
/* try to load super root */
if (nilfs_rw16(segsum->ss_flags) & NILFS_SS_SR) {
DPRINTF(VOLUMES, (" try super root\n"));
error = nilfs_load_super_root(nilfsdev, ri);
if (error)
break; /* confused */
/* wipe current list of ri */
while (!STAILQ_EMPTY(&ri_list)) {
i_ri = STAILQ_FIRST(&ri_list);
STAILQ_REMOVE_HEAD(&ri_list, next);
free(i_ri, M_NILFSTEMP);
}
super = &nilfsdev->super;
super->s_last_pseg = nilfs_rw64(ri->pseg);
super->s_last_cno = cno++;
super->s_last_seq = segsum->ss_seq;
super->s_state = nilfs_rw16(NILFS_VALID_FS);
} else {
STAILQ_INSERT_TAIL(&ri_list, ri, next);
ori = ri;
ri = malloc(sizeof(struct nilfs_recover_info),
M_NILFSTEMP, M_WAITOK);
memset(ri, 0, sizeof(struct nilfs_recover_info));
ri->segnum = ori->segnum;
ri->pseg = ori->pseg;
/* segsum keeps pointing to the `old' ri */
}
/* continue to the next pseg */
segsum_size = nilfs_rw32(segsum->ss_sumbytes);
nsumblk = (segsum_size - 1) / nilfsdev->blocksize + 1;
nfileblk = nilfs_rw32(segsum->ss_nblocks) - nsumblk;
/* calculate next partial segment location */
ri->pseg += nsumblk + nfileblk;
/* did we reach the end of the segment? if so, go to the next */
nilfs_get_segment_range(nilfsdev, ri->segnum, &seg_start, &seg_end);
if (ri->pseg >= seg_end)
ri->pseg = nilfs_rw64(segsum->ss_next);
ri->segnum = nilfs_get_segnum_of_block(nilfsdev, ri->pseg);
}
/*
* XXX No roll-forward yet of the remaining partial segments.
*/
/* wipe current list of ri */
while (!STAILQ_EMPTY(&ri_list)) {
i_ri = STAILQ_FIRST(&ri_list);
STAILQ_REMOVE_HEAD(&ri_list, next);
printf("nilfs: ignoring pseg at %"PRIu64"\n", i_ri->pseg);
free(i_ri, M_NILFSTEMP);
}
free(ri, M_NILFSTEMP);
}
/* --------------------------------------------------------------------- */
/*
* Genfs interfacing
*
* static const struct genfs_ops nilfs_genfsops = {
* .gop_size = genfs_size,
* size of transfers
* .gop_alloc = nilfs_gop_alloc,
* allocate len bytes at offset
* .gop_write = genfs_gop_write,
* putpages interface code
* .gop_markupdate = nilfs_gop_markupdate,
* set update/modify flags etc.
* }
*/
/*
* Callback from genfs to allocate len bytes at offset off; only called when
* filling up gaps in the allocation.
*/
static int
nilfs_gop_alloc(struct vnode *vp, off_t off,
off_t len, int flags, kauth_cred_t cred)
{
DPRINTF(NOTIMPL, ("nilfs_gop_alloc not implemented\n"));
DPRINTF(ALLOC, ("nilfs_gop_alloc called for %"PRIu64" bytes\n", len));
return 0;
}
/*
* callback from genfs to update our flags
*/
static void
nilfs_gop_markupdate(struct vnode *vp, int flags)
{
struct nilfs_node *nilfs_node = VTOI(vp);
u_long mask = 0;
if ((flags & GOP_UPDATE_ACCESSED) != 0) {
mask = IN_ACCESS;
}
if ((flags & GOP_UPDATE_MODIFIED) != 0) {
if (vp->v_type == VREG) {
mask |= IN_CHANGE | IN_UPDATE;
} else {
mask |= IN_MODIFY;
}
}
if (mask) {
nilfs_node->i_flags |= mask;
}
}
static const struct genfs_ops nilfs_genfsops = {
.gop_size = genfs_size,
.gop_alloc = nilfs_gop_alloc,
.gop_write = genfs_gop_write_rwmap,
.gop_markupdate = nilfs_gop_markupdate,
};
/* --------------------------------------------------------------------- */
static void
nilfs_register_node(struct nilfs_node *node)
{
struct nilfs_mount *ump;
struct nilfs_node *chk;
uint32_t hashline;
ump = node->ump;
mutex_enter(&ump->ihash_lock);
/* add to our hash table */
hashline = nilfs_calchash(node->ino) & NILFS_INODE_HASHMASK;
#ifdef DEBUG
LIST_FOREACH(chk, &ump->nilfs_nodes[hashline], hashchain) {
assert(chk);
if (chk->ino == node->ino)
panic("Double node entered\n");
}
#else
chk = NULL;
#endif
LIST_INSERT_HEAD(&ump->nilfs_nodes[hashline], node, hashchain);
mutex_exit(&ump->ihash_lock);
}
static void
nilfs_deregister_node(struct nilfs_node *node)
{
struct nilfs_mount *ump;
ump = node->ump;
mutex_enter(&ump->ihash_lock);
/* remove from hash list */
LIST_REMOVE(node, hashchain);
mutex_exit(&ump->ihash_lock);
}
static struct nilfs_node *
nilfs_hash_lookup(struct nilfs_mount *ump, ino_t ino)
{
struct nilfs_node *node;
struct vnode *vp;
uint32_t hashline;
loop:
mutex_enter(&ump->ihash_lock);
/* search our hash table */
hashline = nilfs_calchash(ino) & NILFS_INODE_HASHMASK;
LIST_FOREACH(node, &ump->nilfs_nodes[hashline], hashchain) {
assert(node);
if (node->ino == ino) {
vp = node->vnode;
assert(vp);
mutex_enter(vp->v_interlock);
mutex_exit(&ump->ihash_lock);
if (vget(vp, LK_EXCLUSIVE))
goto loop;
return node;
}
}
mutex_exit(&ump->ihash_lock);
return NULL;
}
/* node action implementators */
extern int (**nilfs_vnodeop_p)(void *);
int
nilfs_get_node_raw(struct nilfs_device *nilfsdev, struct nilfs_mount *ump,
uint64_t ino, struct nilfs_inode *inode, struct nilfs_node **nodep)
{
struct nilfs_node *node;
struct vnode *nvp;
struct mount *mp;
int (**vnodeops)(void *);
int error;
*nodep = NULL;
vnodeops = nilfs_vnodeop_p;
/* associate with mountpoint if present*/
mp = ump? ump->vfs_mountp : NULL;
error = getnewvnode(VT_NILFS, mp, vnodeops, NULL, &nvp);
if (error)
return error;
/* lock node */
error = vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY);
if (error) {
nvp->v_data = NULL;
ungetnewvnode(nvp);
return error;
}
node = pool_get(&nilfs_node_pool, PR_WAITOK);
memset(node, 0, sizeof(struct nilfs_node));
/* crosslink */
node->vnode = nvp;
node->ump = ump;
node->nilfsdev = nilfsdev;
nvp->v_data = node;
/* initiase nilfs node */
node->ino = ino;
node->inode = *inode;
node->lockf = NULL;
/* needed? */
mutex_init(&node->node_mutex, MUTEX_DEFAULT, IPL_NONE);
cv_init(&node->node_lock, "nilfsnlk");
/* initialise genfs */
genfs_node_init(nvp, &nilfs_genfsops);
/* check if we're fetching the root */
if (ino == NILFS_ROOT_INO)
nvp->v_vflag |= VV_ROOT;
/* update vnode's file type XXX is there a function for this? */
nvp->v_type = VREG;
if (S_ISDIR(inode->i_mode))
nvp->v_type = VDIR;
if (S_ISLNK(inode->i_mode))
nvp->v_type = VLNK;
#if 0
if (S_ISCHR(inode->i_mode))
nvp->v_type = VCHR;
if (S_ISBLK(inode->i_mode))
nvp->v_type = VBLK;
#endif
/* XXX what else? */
/* fixup inode size for system nodes */
if ((ino < NILFS_USER_INO) && (ino != NILFS_ROOT_INO)) {
DPRINTF(VOLUMES, ("NEED TO GET my size for inode %"PRIu64"\n",
ino));
/* for now set it to maximum, -1 is illegal */
inode->i_size = nilfs_rw64(((uint64_t) -2));
}
uvm_vnp_setsize(nvp, nilfs_rw64(inode->i_size));
if (ump)
nilfs_register_node(node);
/* return node */
*nodep = node;
return 0;
}
int
nilfs_get_node(struct nilfs_mount *ump, uint64_t ino, struct nilfs_node **nodep)
{
struct nilfs_device *nilfsdev;
struct nilfs_inode inode, *entry;
struct buf *bp;
uint64_t ivblocknr;
uint32_t entry_in_block;
int error;
/* lookup node in hash table */
*nodep = nilfs_hash_lookup(ump, ino);
if (*nodep)
return 0;
/* lock to disallow simultanious creation of same udf_node */
mutex_enter(&ump->get_node_lock);
/* relookup since it could be created while waiting for the mutex */
*nodep = nilfs_hash_lookup(ump, ino);
if (*nodep) {
mutex_exit(&ump->get_node_lock);
return 0;
}
/* create new inode; XXX check could be handier */
if ((ino < NILFS_ATIME_INO) && (ino != NILFS_ROOT_INO)) {
printf("nilfs_get_node: system ino %"PRIu64" not in mount "
"point!\n", ino);
mutex_exit(&ump->get_node_lock);
return ENOENT;
}
/* lookup inode in the ifile */
DPRINTF(NODE, ("lookup ino %"PRIu64"\n", ino));
/* lookup inode structure in mountpoints ifile */
nilfsdev = ump->nilfsdev;
nilfs_mdt_trans(&nilfsdev->ifile_mdt, ino, &ivblocknr, &entry_in_block);
error = nilfs_bread(ump->ifile_node, ivblocknr, NOCRED, 0, &bp);
if (error) {
mutex_exit(&ump->get_node_lock);
return ENOENT;
}
/* get inode entry */
entry = (struct nilfs_inode *) bp->b_data + entry_in_block;
inode = *entry;
brelse(bp, BC_AGE);
/* get node */
error = nilfs_get_node_raw(ump->nilfsdev, ump, ino, &inode, nodep);
mutex_exit(&ump->get_node_lock);
return error;
}
void
nilfs_dispose_node(struct nilfs_node **nodep)
{
struct vnode *vp;
struct nilfs_node *node;
/* protect against rogue values */
if (!*nodep)
return;
node = *nodep;
vp = node->vnode;
/* remove dirhash if present */
dirhash_purge(&node->dir_hash);
/* remove from our hash lookup table */
if (node->ump)
nilfs_deregister_node(node);
/* destroy our locks */
mutex_destroy(&node->node_mutex);
cv_destroy(&node->node_lock);
/* dissociate from our vnode */
genfs_node_destroy(node->vnode);
vp->v_data = NULL;
/* free our associated memory */
pool_put(&nilfs_node_pool, node);
*nodep = NULL;
}
void
nilfs_itimes(struct nilfs_node *node, struct timespec *acc,
struct timespec *mod, struct timespec *birth)
{
}
int
nilfs_update(struct vnode *node, struct timespec *acc,
struct timespec *mod, struct timespec *birth, int updflags)
{
return EROFS;
}
int
nilfs_chsize(struct vnode *vp, u_quad_t newsize, kauth_cred_t cred)
{
return EROFS;
}