diff options
Diffstat (limited to 'usr/src/boot/lib/libstand/nandfs.c')
| -rw-r--r-- | usr/src/boot/lib/libstand/nandfs.c | 1061 |
1 files changed, 1061 insertions, 0 deletions
diff --git a/usr/src/boot/lib/libstand/nandfs.c b/usr/src/boot/lib/libstand/nandfs.c new file mode 100644 index 0000000000..b8c51e3b5a --- /dev/null +++ b/usr/src/boot/lib/libstand/nandfs.c @@ -0,0 +1,1061 @@ +/*- + * 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[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 < 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 < 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 < NDADDR) { + *vblknr = ino->i_db[lblknr]; + return (0); + } + + lblknr -= NDADDR; + + /* + * nindir[0] = NINDIR + * nindir[1] = NINDIR**2 + * nindir[2] = NINDIR**3 + * etc + */ + for (level = 0; level < 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 == 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 = (length + (bsize - 1)) / 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); +} |