diff options
Diffstat (limited to 'qemu/roms/openbios/fs/grubfs/fsys_jfs.c')
| -rw-r--r-- | qemu/roms/openbios/fs/grubfs/fsys_jfs.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/qemu/roms/openbios/fs/grubfs/fsys_jfs.c b/qemu/roms/openbios/fs/grubfs/fsys_jfs.c new file mode 100644 index 000000000..66469e686 --- /dev/null +++ b/qemu/roms/openbios/fs/grubfs/fsys_jfs.c @@ -0,0 +1,404 @@ +/* fsys_jfs.c - an implementation for the IBM JFS file system */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2001,2002 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, + * MA 02110-1301, USA. + */ + +#ifdef FSYS_JFS + +#include "shared.h" +#include "filesys.h" +#include "jfs.h" + +#define MAX_LINK_COUNT 8 + +#define DTTYPE_INLINE 0 +#define DTTYPE_PAGE 1 + +struct jfs_info +{ + int bsize; + int l2bsize; + int bdlog; + int xindex; + int xlastindex; + int sindex; + int slastindex; + int de_index; + int dttype; + xad_t *xad; + ldtentry_t *de; +}; + +static struct jfs_info jfs; + +#define xtpage ((xtpage_t *)FSYS_BUF) +#define dtpage ((dtpage_t *)((char *)FSYS_BUF + 4096)) +#define fileset ((dinode_t *)((char *)FSYS_BUF + 8192)) +#define inode ((dinode_t *)((char *)FSYS_BUF + 8192 + sizeof(dinode_t))) +#define dtroot ((dtroot_t *)(&inode->di_btroot)) + +static ldtentry_t de_always[2] = { + {1, -1, 2, {'.', '.'}, 0}, + {1, -1, 1, {'.'}, 0} +}; + +static int +isinxt (s64 key, s64 offset, s64 len) +{ + return (key >= offset) ? (key < offset + len ? 1 : 0) : 0; +} + +static xad_t * +first_extent (dinode_t *di) +{ + xtpage_t *xtp; + + jfs.xindex = 2; + xtp = (xtpage_t *)&di->di_btroot; + jfs.xad = &xtp->xad[2]; + if (xtp->header.flag & BT_LEAF) { + jfs.xlastindex = xtp->header.nextindex; + } else { + do { + devread (addressXAD (jfs.xad) << jfs.bdlog, 0, + sizeof(xtpage_t), (char *)xtpage); + jfs.xad = &xtpage->xad[2]; + } while (!(xtpage->header.flag & BT_LEAF)); + jfs.xlastindex = xtpage->header.nextindex; + } + + return jfs.xad; +} + +static xad_t * +next_extent (void) +{ + if (++jfs.xindex < jfs.xlastindex) { + } else if (xtpage->header.next) { + devread (xtpage->header.next << jfs.bdlog, 0, + sizeof(xtpage_t), (char *)xtpage); + jfs.xlastindex = xtpage->header.nextindex; + jfs.xindex = XTENTRYSTART; + jfs.xad = &xtpage->xad[XTENTRYSTART]; + } else { + return NULL; + } + return ++jfs.xad; +} + + +static void +di_read (u32 inum, dinode_t *di) +{ + s64 key; + u32 xd, ioffset; + s64 offset; + xad_t *xad; + pxd_t pxd; + + key = (((inum >> L2INOSPERIAG) << L2INOSPERIAG) + 4096) >> jfs.l2bsize; + xd = (inum & (INOSPERIAG - 1)) >> L2INOSPEREXT; + ioffset = ((inum & (INOSPERIAG - 1)) & (INOSPEREXT - 1)) << L2DISIZE; + xad = first_extent (fileset); + do { + offset = offsetXAD (xad); + if (isinxt (key, offset, lengthXAD (xad))) { + devread ((addressXAD (xad) + key - offset) << jfs.bdlog, + 3072 + xd*sizeof(pxd_t), sizeof(pxd_t), (char *)&pxd); + devread (addressPXD (&pxd) << jfs.bdlog, + ioffset, DISIZE, (char *)di); + break; + } + } while ((xad = next_extent ())); +} + +static ldtentry_t * +next_dentry (void) +{ + ldtentry_t *de; + s8 *stbl; + + if (jfs.dttype == DTTYPE_INLINE) { + if (jfs.sindex < jfs.slastindex) { + return (ldtentry_t *)&dtroot->slot[(int)dtroot->header.stbl[jfs.sindex++]]; + } + } else { + de = (ldtentry_t *)dtpage->slot; + stbl = (s8 *)&de[(int)dtpage->header.stblindex]; + if (jfs.sindex < jfs.slastindex) { + return &de[(int)stbl[jfs.sindex++]]; + } else if (dtpage->header.next) { + devread (dtpage->header.next << jfs.bdlog, 0, + sizeof(dtpage_t), (char *)dtpage); + jfs.slastindex = dtpage->header.nextindex; + jfs.sindex = 1; + return &de[(int)((s8 *)&de[(int)dtpage->header.stblindex])[0]]; + } + } + + return (jfs.de_index < 2) ? &de_always[jfs.de_index++] : NULL; +} + +static ldtentry_t * +first_dentry (void) +{ + dtroot_t *dtr; + pxd_t *xd; + idtentry_t *de; + + dtr = (dtroot_t *)&inode->di_btroot; + jfs.sindex = 0; + jfs.de_index = 0; + + de_always[0].inumber = inode->di_parent; + de_always[1].inumber = inode->di_number; + if (dtr->header.flag & BT_LEAF) { + jfs.dttype = DTTYPE_INLINE; + jfs.slastindex = dtr->header.nextindex; + } else { + de = (idtentry_t *)dtpage->slot; + jfs.dttype = DTTYPE_PAGE; + xd = &((idtentry_t *)dtr->slot)[(int)dtr->header.stbl[0]].xd; + for (;;) { + devread (addressPXD (xd) << jfs.bdlog, 0, + sizeof(dtpage_t), (char *)dtpage); + if (dtpage->header.flag & BT_LEAF) + break; + xd = &de[(int)((s8 *)&de[(int)dtpage->header.stblindex])[0]].xd; + } + jfs.slastindex = dtpage->header.nextindex; + } + + return next_dentry (); +} + + +static dtslot_t * +next_dslot (int next) +{ + return (jfs.dttype == DTTYPE_INLINE) + ? (dtslot_t *)&dtroot->slot[next] + : &((dtslot_t *)dtpage->slot)[next]; +} + +static void +uni2ansi (UniChar *uni, char *ansi, int len) +{ + for (; len; len--, uni++) + *ansi++ = (*uni & 0xff80) ? '?' : *(char *)uni; +} + +int +jfs_mount (void) +{ + struct jfs_superblock super; + + if (part_length < MINJFS >> SECTOR_BITS + || !devread (SUPER1_OFF >> SECTOR_BITS, 0, + sizeof(struct jfs_superblock), (char *)&super) + || (super.s_magic != JFS_MAGIC) + || !devread ((AITBL_OFF >> SECTOR_BITS) + FILESYSTEM_I, + 0, DISIZE, (char*)fileset)) { + return 0; + } + + jfs.bsize = super.s_bsize; + jfs.l2bsize = super.s_l2bsize; + jfs.bdlog = jfs.l2bsize - SECTOR_BITS; + + return 1; +} + +int +jfs_read (char *buf, int len) +{ + xad_t *xad; + s64 endofprev, endofcur; + s64 offset, xadlen; + int toread, startpos, endpos; + + startpos = filepos; + endpos = filepos + len; + endofprev = (1ULL << 62) - 1; + xad = first_extent (inode); + do { + offset = offsetXAD (xad); + xadlen = lengthXAD (xad); + if (isinxt (filepos >> jfs.l2bsize, offset, xadlen)) { + endofcur = (offset + xadlen) << jfs.l2bsize; + toread = (endofcur >= endpos) + ? len : (endofcur - filepos); + + disk_read_func = disk_read_hook; + devread (addressXAD (xad) << jfs.bdlog, + filepos - (offset << jfs.l2bsize), toread, buf); + disk_read_func = NULL; + + buf += toread; + len -= toread; + filepos += toread; + } else if (offset > endofprev) { + toread = ((offset << jfs.l2bsize) >= endpos) + ? len : ((offset - endofprev) << jfs.l2bsize); + len -= toread; + filepos += toread; + for (; toread; toread--) { + *buf++ = 0; + } + continue; + } + endofprev = offset + xadlen; + xad = next_extent (); + } while (len > 0 && xad); + + return filepos - startpos; +} + +int +jfs_dir (char *dirname) +{ + char *ptr, *rest, ch; + ldtentry_t *de; + dtslot_t *ds; + u32 inum, parent_inum; + s64 di_size; + u32 di_mode; + int namlen, cmp, n, link_count; + char namebuf[JFS_NAME_MAX + 1], linkbuf[JFS_PATH_MAX]; + + parent_inum = inum = ROOT_I; + link_count = 0; + for (;;) { + di_read (inum, inode); + di_size = inode->di_size; + di_mode = inode->di_mode; + + if ((di_mode & IFMT) == IFLNK) { + if (++link_count > MAX_LINK_COUNT) { + errnum = ERR_SYMLINK_LOOP; + return 0; + } + if (di_size < (di_mode & INLINEEA ? 256 : 128)) { + grub_memmove (linkbuf, inode->di_fastsymlink, di_size); + n = di_size; + } else if (di_size < JFS_PATH_MAX - 1) { + filepos = 0; + filemax = di_size; + n = jfs_read (linkbuf, filemax); + } else { + errnum = ERR_FILELENGTH; + return 0; + } + + inum = (linkbuf[0] == '/') ? ROOT_I : parent_inum; + while (n < (JFS_PATH_MAX - 1) && (linkbuf[n++] = *dirname++)); + linkbuf[n] = 0; + dirname = linkbuf; + continue; + } + + if (!*dirname || isspace (*dirname)) { + if ((di_mode & IFMT) != IFREG) { + errnum = ERR_BAD_FILETYPE; + return 0; + } + filepos = 0; + filemax = di_size; + return 1; + } + + if ((di_mode & IFMT) != IFDIR) { + errnum = ERR_BAD_FILETYPE; + return 0; + } + + for (; *dirname == '/'; dirname++); + + for (rest = dirname; (ch = *rest) && !isspace (ch) && ch != '/'; rest++); + *rest = 0; + + de = first_dentry (); + for (;;) { + namlen = de->namlen; + if (de->next == -1) { + uni2ansi (de->name, namebuf, namlen); + namebuf[namlen] = 0; + } else { + uni2ansi (de->name, namebuf, DTLHDRDATALEN); + ptr = namebuf; + ptr += DTLHDRDATALEN; + namlen -= DTLHDRDATALEN; + ds = next_dslot (de->next); + while (ds->next != -1) { + uni2ansi (ds->name, ptr, DTSLOTDATALEN); + ptr += DTSLOTDATALEN; + namlen -= DTSLOTDATALEN; + ds = next_dslot (ds->next); + } + uni2ansi (ds->name, ptr, namlen); + ptr += namlen; + *ptr = 0; + } + + cmp = (!*dirname) ? -1 : substring (dirname, namebuf); +#ifndef STAGE1_5 + if (print_possibilities && ch != '/' + && cmp <= 0) { + if (print_possibilities > 0) + print_possibilities = -print_possibilities; + print_a_completion (namebuf); + } else +#endif + if (cmp == 0) { + parent_inum = inum; + inum = de->inumber; + *(dirname = rest) = ch; + break; + } + de = next_dentry (); + if (de == NULL) { + if (print_possibilities < 0) + return 1; + + errnum = ERR_FILE_NOT_FOUND; + *rest = ch; + return 0; + } + } + } +} + +int +jfs_embed (int *start_sector, int needed_sectors) +{ + struct jfs_superblock super; + + if (needed_sectors > 63 + || !devread (SUPER1_OFF >> SECTOR_BITS, 0, + sizeof (struct jfs_superblock), + (char *)&super) + || (super.s_magic != JFS_MAGIC)) { + return 0; + } + + *start_sector = 1; + return 1; +} + +#endif /* FSYS_JFS */ |