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freebsd-skq/stand/libsa/nandfs.c
Ed Maste d8ba45e213 Revert r313780 (UFS_ prefix)
2018-03-17 12:59:55 +00:00

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/*-
* Copyright (c) 2010-2012 Semihalf.
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/stdint.h>
#include <ufs/ufs/dinode.h>
#include <fs/nandfs/nandfs_fs.h>
#include "stand.h"
#include "string.h"
#include "zlib.h"
#define DEBUG
#undef DEBUG
#ifdef DEBUG
#define NANDFS_DEBUG(fmt, args...) do { \
printf("NANDFS_DEBUG:" fmt "\n", ##args); } while (0)
#else
#define NANDFS_DEBUG(fmt, args...)
#endif
struct nandfs_mdt {
uint32_t entries_per_block;
uint32_t entries_per_group;
uint32_t blocks_per_group;
uint32_t groups_per_desc_block; /* desc is super group */
uint32_t blocks_per_desc_block; /* desc is super group */
};
struct bmap_buf {
LIST_ENTRY(bmap_buf) list;
nandfs_daddr_t blknr;
uint64_t *map;
};
struct nandfs_node {
struct nandfs_inode *inode;
LIST_HEAD(, bmap_buf) bmap_bufs;
};
struct nandfs {
int nf_blocksize;
int nf_sectorsize;
int nf_cpno;
struct open_file *nf_file;
struct nandfs_node *nf_opened_node;
u_int nf_offset;
uint8_t *nf_buf;
int64_t nf_buf_blknr;
struct nandfs_fsdata *nf_fsdata;
struct nandfs_super_block *nf_sb;
struct nandfs_segment_summary nf_segsum;
struct nandfs_checkpoint nf_checkpoint;
struct nandfs_super_root nf_sroot;
struct nandfs_node nf_ifile;
struct nandfs_node nf_datfile;
struct nandfs_node nf_cpfile;
struct nandfs_mdt nf_datfile_mdt;
struct nandfs_mdt nf_ifile_mdt;
int nf_nindir[NANDFS_NIADDR];
};
static int nandfs_open(const char *, struct open_file *);
static int nandfs_close(struct open_file *);
static int nandfs_read(struct open_file *, void *, size_t, size_t *);
static off_t nandfs_seek(struct open_file *, off_t, int);
static int nandfs_stat(struct open_file *, struct stat *);
static int nandfs_readdir(struct open_file *, struct dirent *);
static int nandfs_buf_read(struct nandfs *, void **, size_t *);
static struct nandfs_node *nandfs_lookup_path(struct nandfs *, const char *);
static int nandfs_read_inode(struct nandfs *, struct nandfs_node *,
nandfs_lbn_t, u_int, void *, int);
static int nandfs_read_blk(struct nandfs *, nandfs_daddr_t, void *, int);
static int nandfs_bmap_lookup(struct nandfs *, struct nandfs_node *,
nandfs_lbn_t, nandfs_daddr_t *, int);
static int nandfs_get_checkpoint(struct nandfs *, uint64_t,
struct nandfs_checkpoint *);
static nandfs_daddr_t nandfs_vtop(struct nandfs *, nandfs_daddr_t);
static void nandfs_calc_mdt_consts(int, struct nandfs_mdt *, int);
static void nandfs_mdt_trans(struct nandfs_mdt *, uint64_t,
nandfs_daddr_t *, uint32_t *);
static int ioread(struct open_file *, off_t, void *, u_int);
static int nandfs_probe_sectorsize(struct open_file *);
struct fs_ops nandfs_fsops = {
"nandfs",
nandfs_open,
nandfs_close,
nandfs_read,
null_write,
nandfs_seek,
nandfs_stat,
nandfs_readdir
};
#define NINDIR(fs) ((fs)->nf_blocksize / sizeof(nandfs_daddr_t))
/* from NetBSD's src/sys/net/if_ethersubr.c */
static uint32_t
nandfs_crc32(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;
crc = crc ^ ~0U;
for (i = 0; i < len; i++) {
crc ^= buf[i];
crc = (crc >> 4) ^ crctab[crc & 0xf];
crc = (crc >> 4) ^ crctab[crc & 0xf];
}
return (crc ^ ~0U);
}
static int
nandfs_check_fsdata_crc(struct nandfs_fsdata *fsdata)
{
uint32_t fsdata_crc, comp_crc;
if (fsdata->f_magic != NANDFS_FSDATA_MAGIC)
return (0);
/* Preserve crc */
fsdata_crc = fsdata->f_sum;
/* Calculate */
fsdata->f_sum = (0);
comp_crc = nandfs_crc32(0, (uint8_t *)fsdata, fsdata->f_bytes);
/* Restore */
fsdata->f_sum = fsdata_crc;
/* Check CRC */
return (fsdata_crc == comp_crc);
}
static int
nandfs_check_superblock_crc(struct nandfs_fsdata *fsdata,
struct nandfs_super_block *super)
{
uint32_t super_crc, comp_crc;
/* Check super block magic */
if (super->s_magic != NANDFS_SUPER_MAGIC)
return (0);
/* Preserve CRC */
super_crc = super->s_sum;
/* Calculate */
super->s_sum = (0);
comp_crc = nandfs_crc32(0, (uint8_t *)super, fsdata->f_sbbytes);
/* Restore */
super->s_sum = super_crc;
/* Check CRC */
return (super_crc == comp_crc);
}
static int
nandfs_find_super_block(struct nandfs *fs, struct open_file *f)
{
struct nandfs_super_block *sb;
int i, j, n, s;
int sectors_to_read, error;
sb = malloc(fs->nf_sectorsize);
if (sb == NULL)
return (ENOMEM);
memset(fs->nf_sb, 0, sizeof(*fs->nf_sb));
sectors_to_read = (NANDFS_NFSAREAS * fs->nf_fsdata->f_erasesize) /
fs->nf_sectorsize;
for (i = 0; i < sectors_to_read; i++) {
NANDFS_DEBUG("reading i %d offset %d\n", i,
i * fs->nf_sectorsize);
error = ioread(f, i * fs->nf_sectorsize, (char *)sb,
fs->nf_sectorsize);
if (error) {
NANDFS_DEBUG("error %d\n", error);
continue;
}
n = fs->nf_sectorsize / sizeof(struct nandfs_super_block);
s = 0;
if ((i * fs->nf_sectorsize) % fs->nf_fsdata->f_erasesize == 0) {
if (fs->nf_sectorsize == sizeof(struct nandfs_fsdata))
continue;
else {
s += (sizeof(struct nandfs_fsdata) /
sizeof(struct nandfs_super_block));
}
}
for (j = s; j < n; j++) {
if (!nandfs_check_superblock_crc(fs->nf_fsdata, &sb[j]))
continue;
NANDFS_DEBUG("magic %x wtime %jd, lastcp 0x%jx\n",
sb[j].s_magic, sb[j].s_wtime, sb[j].s_last_cno);
if (sb[j].s_last_cno > fs->nf_sb->s_last_cno)
memcpy(fs->nf_sb, &sb[j], sizeof(*fs->nf_sb));
}
}
free(sb);
return (fs->nf_sb->s_magic != 0 ? 0 : EINVAL);
}
static int
nandfs_find_fsdata(struct nandfs *fs, struct open_file *f)
{
int offset, error, i;
NANDFS_DEBUG("starting\n");
offset = 0;
for (i = 0; i < 64 * NANDFS_NFSAREAS; i++) {
error = ioread(f, offset, (char *)fs->nf_fsdata,
sizeof(struct nandfs_fsdata));
if (error)
return (error);
if (fs->nf_fsdata->f_magic == NANDFS_FSDATA_MAGIC) {
NANDFS_DEBUG("found at %x, volume %s\n", offset,
fs->nf_fsdata->f_volume_name);
if (nandfs_check_fsdata_crc(fs->nf_fsdata))
break;
}
offset += fs->nf_sectorsize;
}
return (error);
}
static int
nandfs_read_structures(struct nandfs *fs, struct open_file *f)
{
int error;
error = nandfs_find_fsdata(fs, f);
if (error)
return (error);
error = nandfs_find_super_block(fs, f);
if (error == 0)
NANDFS_DEBUG("selected sb with w_time %jd last_pseg %jx\n",
fs->nf_sb->s_wtime, fs->nf_sb->s_last_pseg);
return (error);
}
static int
nandfs_mount(struct nandfs *fs, struct open_file *f)
{
int err = 0, level;
uint64_t last_pseg;
fs->nf_fsdata = malloc(sizeof(struct nandfs_fsdata));
fs->nf_sb = malloc(sizeof(struct nandfs_super_block));
err = nandfs_read_structures(fs, f);
if (err) {
free(fs->nf_fsdata);
free(fs->nf_sb);
return (err);
}
fs->nf_blocksize = 1 << (fs->nf_fsdata->f_log_block_size + 10);
NANDFS_DEBUG("using superblock with wtime %jd\n", fs->nf_sb->s_wtime);
fs->nf_cpno = fs->nf_sb->s_last_cno;
last_pseg = fs->nf_sb->s_last_pseg;
/*
* Calculate indirect block levels.
*/
nandfs_daddr_t mult;
mult = 1;
for (level = 0; level < NANDFS_NIADDR; level++) {
mult *= NINDIR(fs);
fs->nf_nindir[level] = mult;
}
nandfs_calc_mdt_consts(fs->nf_blocksize, &fs->nf_datfile_mdt,
fs->nf_fsdata->f_dat_entry_size);
nandfs_calc_mdt_consts(fs->nf_blocksize, &fs->nf_ifile_mdt,
fs->nf_fsdata->f_inode_size);
err = ioread(f, last_pseg * fs->nf_blocksize, &fs->nf_segsum,
sizeof(struct nandfs_segment_summary));
if (err) {
free(fs->nf_sb);
free(fs->nf_fsdata);
return (err);
}
err = ioread(f, (last_pseg + fs->nf_segsum.ss_nblocks - 1) *
fs->nf_blocksize, &fs->nf_sroot, sizeof(struct nandfs_super_root));
if (err) {
free(fs->nf_sb);
free(fs->nf_fsdata);
return (err);
}
fs->nf_datfile.inode = &fs->nf_sroot.sr_dat;
LIST_INIT(&fs->nf_datfile.bmap_bufs);
fs->nf_cpfile.inode = &fs->nf_sroot.sr_cpfile;
LIST_INIT(&fs->nf_cpfile.bmap_bufs);
err = nandfs_get_checkpoint(fs, fs->nf_cpno, &fs->nf_checkpoint);
if (err) {
free(fs->nf_sb);
free(fs->nf_fsdata);
return (err);
}
NANDFS_DEBUG("checkpoint cp_cno=%lld\n", fs->nf_checkpoint.cp_cno);
NANDFS_DEBUG("checkpoint cp_inodes_count=%lld\n",
fs->nf_checkpoint.cp_inodes_count);
NANDFS_DEBUG("checkpoint cp_ifile_inode.i_blocks=%lld\n",
fs->nf_checkpoint.cp_ifile_inode.i_blocks);
fs->nf_ifile.inode = &fs->nf_checkpoint.cp_ifile_inode;
LIST_INIT(&fs->nf_ifile.bmap_bufs);
return (0);
}
#define NINDIR(fs) ((fs)->nf_blocksize / sizeof(nandfs_daddr_t))
static int
nandfs_open(const char *path, struct open_file *f)
{
struct nandfs *fs;
struct nandfs_node *node;
int err, bsize, level;
NANDFS_DEBUG("nandfs_open('%s', %p)\n", path, f);
fs = malloc(sizeof(struct nandfs));
f->f_fsdata = fs;
fs->nf_file = f;
bsize = nandfs_probe_sectorsize(f);
if (bsize < 0) {
printf("Cannot probe medium sector size\n");
return (EINVAL);
}
fs->nf_sectorsize = bsize;
/*
* Calculate indirect block levels.
*/
nandfs_daddr_t mult;
mult = 1;
for (level = 0; level < NANDFS_NIADDR; level++) {
mult *= NINDIR(fs);
fs->nf_nindir[level] = mult;
}
NANDFS_DEBUG("fs %p nf_sectorsize=%x\n", fs, fs->nf_sectorsize);
err = nandfs_mount(fs, f);
if (err) {
NANDFS_DEBUG("Cannot mount nandfs: %s\n", strerror(err));
return (err);
}
node = nandfs_lookup_path(fs, path);
if (node == NULL)
return (EINVAL);
fs->nf_offset = 0;
fs->nf_buf = NULL;
fs->nf_buf_blknr = -1;
fs->nf_opened_node = node;
LIST_INIT(&fs->nf_opened_node->bmap_bufs);
return (0);
}
static void
nandfs_free_node(struct nandfs_node *node)
{
struct bmap_buf *bmap, *tmp;
free(node->inode);
LIST_FOREACH_SAFE(bmap, &node->bmap_bufs, list, tmp) {
LIST_REMOVE(bmap, list);
free(bmap->map);
free(bmap);
}
free(node);
}
static int
nandfs_close(struct open_file *f)
{
struct nandfs *fs = f->f_fsdata;
NANDFS_DEBUG("nandfs_close(%p)\n", f);
if (fs->nf_buf != NULL)
free(fs->nf_buf);
nandfs_free_node(fs->nf_opened_node);
free(fs->nf_sb);
free(fs);
return (0);
}
static int
nandfs_read(struct open_file *f, void *addr, size_t size, size_t *resid)
{
struct nandfs *fs = (struct nandfs *)f->f_fsdata;
size_t csize, buf_size;
void *buf;
int error = 0;
NANDFS_DEBUG("nandfs_read(file=%p, addr=%p, size=%d)\n", f, addr, size);
while (size != 0) {
if (fs->nf_offset >= fs->nf_opened_node->inode->i_size)
break;
error = nandfs_buf_read(fs, &buf, &buf_size);
if (error)
break;
csize = size;
if (csize > buf_size)
csize = buf_size;
bcopy(buf, addr, csize);
fs->nf_offset += csize;
addr = (char *)addr + csize;
size -= csize;
}
if (resid)
*resid = size;
return (error);
}
static off_t
nandfs_seek(struct open_file *f, off_t offset, int where)
{
struct nandfs *fs = f->f_fsdata;
off_t off;
u_int size;
NANDFS_DEBUG("nandfs_seek(file=%p, offset=%lld, where=%d)\n", f,
offset, where);
size = fs->nf_opened_node->inode->i_size;
switch (where) {
case SEEK_SET:
off = 0;
break;
case SEEK_CUR:
off = fs->nf_offset;
break;
case SEEK_END:
off = size;
break;
default:
errno = EINVAL;
return (-1);
}
off += offset;
if (off < 0 || off > size) {
errno = EINVAL;
return(-1);
}
fs->nf_offset = (u_int)off;
return (off);
}
static int
nandfs_stat(struct open_file *f, struct stat *sb)
{
struct nandfs *fs = f->f_fsdata;
NANDFS_DEBUG("nandfs_stat(file=%p, stat=%p)\n", f, sb);
sb->st_size = fs->nf_opened_node->inode->i_size;
sb->st_mode = fs->nf_opened_node->inode->i_mode;
sb->st_uid = fs->nf_opened_node->inode->i_uid;
sb->st_gid = fs->nf_opened_node->inode->i_gid;
return (0);
}
static int
nandfs_readdir(struct open_file *f, struct dirent *d)
{
struct nandfs *fs = f->f_fsdata;
struct nandfs_dir_entry *dirent;
void *buf;
size_t buf_size;
NANDFS_DEBUG("nandfs_readdir(file=%p, dirent=%p)\n", f, d);
if (fs->nf_offset >= fs->nf_opened_node->inode->i_size) {
NANDFS_DEBUG("nandfs_readdir(file=%p, dirent=%p) ENOENT\n",
f, d);
return (ENOENT);
}
if (nandfs_buf_read(fs, &buf, &buf_size)) {
NANDFS_DEBUG("nandfs_readdir(file=%p, dirent=%p)"
"buf_read failed\n", f, d);
return (EIO);
}
NANDFS_DEBUG("nandfs_readdir(file=%p, dirent=%p) moving forward\n",
f, d);
dirent = (struct nandfs_dir_entry *)buf;
fs->nf_offset += dirent->rec_len;
strncpy(d->d_name, dirent->name, dirent->name_len);
d->d_name[dirent->name_len] = '\0';
d->d_type = dirent->file_type;
return (0);
}
static int
nandfs_buf_read(struct nandfs *fs, void **buf_p, size_t *size_p)
{
nandfs_daddr_t blknr, blkoff;
blknr = fs->nf_offset / fs->nf_blocksize;
blkoff = fs->nf_offset % fs->nf_blocksize;
if (blknr != fs->nf_buf_blknr) {
if (fs->nf_buf == NULL)
fs->nf_buf = malloc(fs->nf_blocksize);
if (nandfs_read_inode(fs, fs->nf_opened_node, blknr, 1,
fs->nf_buf, 0))
return (EIO);
fs->nf_buf_blknr = blknr;
}
*buf_p = fs->nf_buf + blkoff;
*size_p = fs->nf_blocksize - blkoff;
NANDFS_DEBUG("nandfs_buf_read buf_p=%p size_p=%d\n", *buf_p, *size_p);
if (*size_p > fs->nf_opened_node->inode->i_size - fs->nf_offset)
*size_p = fs->nf_opened_node->inode->i_size - fs->nf_offset;
return (0);
}
static struct nandfs_node *
nandfs_lookup_node(struct nandfs *fs, uint64_t ino)
{
uint64_t blocknr;
int entrynr;
struct nandfs_inode *buffer;
struct nandfs_node *node;
struct nandfs_inode *inode;
NANDFS_DEBUG("nandfs_lookup_node ino=%lld\n", ino);
if (ino == 0) {
printf("nandfs_lookup_node: invalid inode requested\n");
return (NULL);
}
buffer = malloc(fs->nf_blocksize);
inode = malloc(sizeof(struct nandfs_inode));
node = malloc(sizeof(struct nandfs_node));
nandfs_mdt_trans(&fs->nf_ifile_mdt, ino, &blocknr, &entrynr);
if (nandfs_read_inode(fs, &fs->nf_ifile, blocknr, 1, buffer, 0))
return (NULL);
memcpy(inode, &buffer[entrynr], sizeof(struct nandfs_inode));
node->inode = inode;
free(buffer);
return (node);
}
static struct nandfs_node *
nandfs_lookup_path(struct nandfs *fs, const char *path)
{
struct nandfs_node *node;
struct nandfs_dir_entry *dirent;
char *namebuf;
uint64_t i, done, pinode, inode;
int nlinks = 0, counter, len, link_len, nameidx;
uint8_t *buffer, *orig;
char *strp, *lpath;
buffer = malloc(fs->nf_blocksize);
orig = buffer;
namebuf = malloc(2 * MAXPATHLEN + 2);
strncpy(namebuf, path, MAXPATHLEN);
namebuf[MAXPATHLEN] = '\0';
done = nameidx = 0;
lpath = namebuf;
/* Get the root inode */
node = nandfs_lookup_node(fs, NANDFS_ROOT_INO);
inode = NANDFS_ROOT_INO;
while ((strp = strsep(&lpath, "/")) != NULL) {
if (*strp == '\0')
continue;
if ((node->inode->i_mode & IFMT) != IFDIR) {
nandfs_free_node(node);
node = NULL;
goto out;
}
len = strlen(strp);
NANDFS_DEBUG("%s: looking for %s\n", __func__, strp);
for (i = 0; i < node->inode->i_blocks; i++) {
if (nandfs_read_inode(fs, node, i, 1, orig, 0)) {
node = NULL;
goto out;
}
buffer = orig;
done = counter = 0;
while (1) {
dirent =
(struct nandfs_dir_entry *)(void *)buffer;
NANDFS_DEBUG("%s: dirent.name = %s\n",
__func__, dirent->name);
NANDFS_DEBUG("%s: dirent.rec_len = %d\n",
__func__, dirent->rec_len);
NANDFS_DEBUG("%s: dirent.inode = %lld\n",
__func__, dirent->inode);
if (len == dirent->name_len &&
(strncmp(strp, dirent->name, len) == 0) &&
dirent->inode != 0) {
nandfs_free_node(node);
node = nandfs_lookup_node(fs,
dirent->inode);
pinode = inode;
inode = dirent->inode;
done = 1;
break;
}
counter += dirent->rec_len;
buffer += dirent->rec_len;
if (counter == fs->nf_blocksize)
break;
}
if (done)
break;
}
if (!done) {
node = NULL;
goto out;
}
NANDFS_DEBUG("%s: %.*s has mode %o\n", __func__,
dirent->name_len, dirent->name, node->inode->i_mode);
if ((node->inode->i_mode & IFMT) == IFLNK) {
NANDFS_DEBUG("%s: %.*s is symlink\n",
__func__, dirent->name_len, dirent->name);
link_len = node->inode->i_size;
if (++nlinks > MAXSYMLINKS) {
nandfs_free_node(node);
node = NULL;
goto out;
}
if (nandfs_read_inode(fs, node, 0, 1, orig, 0)) {
nandfs_free_node(node);
node = NULL;
goto out;
}
NANDFS_DEBUG("%s: symlink is %.*s\n",
__func__, link_len, (char *)orig);
nameidx = (nameidx == 0) ? MAXPATHLEN + 1 : 0;
bcopy((char *)orig, namebuf + nameidx,
(unsigned)link_len);
if (lpath != NULL) {
namebuf[nameidx + link_len++] = '/';
strncpy(namebuf + nameidx + link_len, lpath,
MAXPATHLEN - link_len);
namebuf[nameidx + MAXPATHLEN] = '\0';
} else
namebuf[nameidx + link_len] = '\0';
NANDFS_DEBUG("%s: strp=%s, lpath=%s, namebuf0=%s, "
"namebuf1=%s, idx=%d\n", __func__, strp, lpath,
namebuf + 0, namebuf + MAXPATHLEN + 1, nameidx);
lpath = namebuf + nameidx;
nandfs_free_node(node);
/*
* If absolute pathname, restart at root. Otherwise
* continue with out parent inode.
*/
inode = (orig[0] == '/') ? NANDFS_ROOT_INO : pinode;
node = nandfs_lookup_node(fs, inode);
}
}
out:
free(namebuf);
free(orig);
return (node);
}
static int
nandfs_read_inode(struct nandfs *fs, struct nandfs_node *node,
nandfs_daddr_t blknr, u_int nblks, void *buf, int raw)
{
uint64_t *pblks;
uint64_t *vblks;
u_int i;
int error;
pblks = malloc(nblks * sizeof(uint64_t));
vblks = malloc(nblks * sizeof(uint64_t));
NANDFS_DEBUG("nandfs_read_inode fs=%p node=%p blknr=%lld nblks=%d\n",
fs, node, blknr, nblks);
for (i = 0; i < nblks; i++) {
error = nandfs_bmap_lookup(fs, node, blknr + i, &vblks[i], raw);
if (error) {
free(pblks);
free(vblks);
return (error);
}
if (raw == 0)
pblks[i] = nandfs_vtop(fs, vblks[i]);
else
pblks[i] = vblks[i];
}
for (i = 0; i < nblks; i++) {
if (ioread(fs->nf_file, pblks[i] * fs->nf_blocksize, buf,
fs->nf_blocksize)) {
free(pblks);
free(vblks);
return (EIO);
}
buf = (void *)((uintptr_t)buf + fs->nf_blocksize);
}
free(pblks);
free(vblks);
return (0);
}
static int
nandfs_read_blk(struct nandfs *fs, nandfs_daddr_t blknr, void *buf, int phys)
{
uint64_t pblknr;
pblknr = (phys ? blknr : nandfs_vtop(fs, blknr));
return (ioread(fs->nf_file, pblknr * fs->nf_blocksize, buf,
fs->nf_blocksize));
}
static int
nandfs_get_checkpoint(struct nandfs *fs, uint64_t cpno,
struct nandfs_checkpoint *cp)
{
uint64_t blocknr;
int blockoff, cp_per_block, dlen;
uint8_t *buf;
NANDFS_DEBUG("nandfs_get_checkpoint(fs=%p cpno=%lld)\n", fs, cpno);
buf = malloc(fs->nf_blocksize);
cpno += NANDFS_CPFILE_FIRST_CHECKPOINT_OFFSET - 1;
dlen = fs->nf_fsdata->f_checkpoint_size;
cp_per_block = fs->nf_blocksize / dlen;
blocknr = cpno / cp_per_block;
blockoff = (cpno % cp_per_block) * dlen;
if (nandfs_read_inode(fs, &fs->nf_cpfile, blocknr, 1, buf, 0)) {
free(buf);
return (EINVAL);
}
memcpy(cp, buf + blockoff, sizeof(struct nandfs_checkpoint));
free(buf);
return (0);
}
static uint64_t *
nandfs_get_map(struct nandfs *fs, struct nandfs_node *node, nandfs_daddr_t blknr,
int phys)
{
struct bmap_buf *bmap;
uint64_t *map;
LIST_FOREACH(bmap, &node->bmap_bufs, list) {
if (bmap->blknr == blknr)
return (bmap->map);
}
map = malloc(fs->nf_blocksize);
if (nandfs_read_blk(fs, blknr, map, phys)) {
free(map);
return (NULL);
}
bmap = malloc(sizeof(struct bmap_buf));
bmap->blknr = blknr;
bmap->map = map;
LIST_INSERT_HEAD(&node->bmap_bufs, bmap, list);
NANDFS_DEBUG("%s:(node=%p, map=%p)\n", __func__, node, map);
return (map);
}
static int
nandfs_bmap_lookup(struct nandfs *fs, struct nandfs_node *node,
nandfs_lbn_t lblknr, nandfs_daddr_t *vblknr, int phys)
{
struct nandfs_inode *ino;
nandfs_daddr_t ind_block_num;
uint64_t *map;
int idx;
int level;
ino = node->inode;
if (lblknr < NANDFS_NDADDR) {
*vblknr = ino->i_db[lblknr];
return (0);
}
lblknr -= NANDFS_NDADDR;
/*
* nindir[0] = NINDIR
* nindir[1] = NINDIR**2
* nindir[2] = NINDIR**3
* etc
*/
for (level = 0; level < NANDFS_NIADDR; level++) {
NANDFS_DEBUG("lblknr=%jx fs->nf_nindir[%d]=%d\n", lblknr, level, fs->nf_nindir[level]);
if (lblknr < fs->nf_nindir[level])
break;
lblknr -= fs->nf_nindir[level];
}
if (level == NANDFS_NIADDR) {
/* Block number too high */
NANDFS_DEBUG("lblknr %jx too high\n", lblknr);
return (EFBIG);
}
ind_block_num = ino->i_ib[level];
for (; level >= 0; level--) {
if (ind_block_num == 0) {
*vblknr = 0; /* missing */
return (0);
}
twiddle(1);
NANDFS_DEBUG("calling get_map with %jx\n", ind_block_num);
map = nandfs_get_map(fs, node, ind_block_num, phys);
if (map == NULL)
return (EIO);
if (level > 0) {
idx = lblknr / fs->nf_nindir[level - 1];
lblknr %= fs->nf_nindir[level - 1];
} else
idx = lblknr;
ind_block_num = ((nandfs_daddr_t *)map)[idx];
}
*vblknr = ind_block_num;
return (0);
}
static nandfs_daddr_t
nandfs_vtop(struct nandfs *fs, nandfs_daddr_t vblocknr)
{
nandfs_lbn_t blocknr;
nandfs_daddr_t pblocknr;
int entrynr;
struct nandfs_dat_entry *dat;
dat = malloc(fs->nf_blocksize);
nandfs_mdt_trans(&fs->nf_datfile_mdt, vblocknr, &blocknr, &entrynr);
if (nandfs_read_inode(fs, &fs->nf_datfile, blocknr, 1, dat, 1)) {
free(dat);
return (0);
}
NANDFS_DEBUG("nandfs_vtop entrynr=%d vblocknr=%lld pblocknr=%lld\n",
entrynr, vblocknr, dat[entrynr].de_blocknr);
pblocknr = dat[entrynr].de_blocknr;
free(dat);
return (pblocknr);
}
static void
nandfs_calc_mdt_consts(int blocksize, struct nandfs_mdt *mdt, int entry_size)
{
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 nandfs_block_group_desc);
mdt->blocks_per_desc_block =
mdt->groups_per_desc_block * mdt->blocks_per_group + 1;
}
static void
nandfs_mdt_trans(struct nandfs_mdt *mdt, uint64_t index,
nandfs_daddr_t *blocknr, uint32_t *entry_in_block)
{
nandfs_daddr_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
ioread(struct open_file *f, off_t pos, void *buf, u_int length)
{
void *buffer;
int err;
int bsize = ((struct nandfs *)f->f_fsdata)->nf_sectorsize;
u_int off, nsec;
off = pos % bsize;
pos /= bsize;
nsec = howmany(length, bsize);
NANDFS_DEBUG("pos=%lld length=%d off=%d nsec=%d\n", pos, length,
off, nsec);
buffer = malloc(nsec * bsize);
err = (f->f_dev->dv_strategy)(f->f_devdata, F_READ, pos,
nsec * bsize, buffer, NULL);
memcpy(buf, (void *)((uintptr_t)buffer + off), length);
free(buffer);
return (err);
}
static int
nandfs_probe_sectorsize(struct open_file *f)
{
void *buffer;
int i, err;
buffer = malloc(16 * 1024);
NANDFS_DEBUG("probing for sector size: ");
for (i = 512; i < (16 * 1024); i <<= 1) {
NANDFS_DEBUG("%d ", i);
err = (f->f_dev->dv_strategy)(f->f_devdata, F_READ, 0, i,
buffer, NULL);
if (err == 0) {
NANDFS_DEBUG("found");
free(buffer);
return (i);
}
}
free(buffer);
NANDFS_DEBUG("not found\n");
return (-1);
}
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