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ufs.c
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ufs.c
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/*
* UFS for MacFUSE
* Amit Singh
* http://osxbook.com
*
* Most of the code in this file comes from the Linux kernel implementation
* of UFS. See fs/ufs/ in the Linux kernel source tree.
*
* The code is Copyright (c) its various authors. It is covered by the
* GNU GENERAL PUBLIC LICENSE Version 2.
*/
#include "ufs.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <ufs/util.c>
static ino_t ufs_find_entry_s(struct inode *dir, const char* name);
static int ufs_get_dirpage(struct inode *inode, sector_t index, char *pagebuf);
static int ufs_read_cylinder_structures(struct super_block *sb);
static void ufs_print_cylinder_stuff(struct super_block* sb,
struct ufs_cylinder_group* cg);
static void ufs_setup_cstotal(struct super_block* sb);
static int ufs_read_cylinder_structures(struct super_block* sb);
static u64 ufs_frag_map(struct inode *inode, sector_t frag, int* error);
int ufs_getfrag_block(struct inode* inode, sector_t fragment,
struct buffer_head* bh_result, int create);
static struct buffer_head* ufs_getfrag(struct inode* inode,
unsigned int fragment,
int create, int* err);
struct buffer_head* ufs_bread(struct inode* inode, unsigned fragment,
int create, int* err);
static int ufs1_read_inode(struct inode* inode, struct ufs_inode* ufs_inode);
static int ufs2_read_inode(struct inode* inode, struct ufs2_inode* ufs2_inode);
static unsigned ufs_last_byte(struct inode* inode, unsigned long page_nr);
static ino_t ufs_find_entry_s(struct inode* dir, const char* name);
#define UFS_USED __attribute__((used))
static struct ufs_dir_entry*
ufs_dotdot_s(struct inode* dir, char* pagebuf) UFS_USED;
static int
ufs_check_page(struct inode* dir, sector_t index, char* page) UFS_USED;
static void
ufs_print_super_stuff(struct super_block* sb,
struct ufs_super_block_first* usb1,
struct ufs_super_block_second* usb2,
struct ufs_super_block_third* usb3) UFS_USED;
enum {
Opt_type_old = UFS_MOUNT_UFSTYPE_OLD,
Opt_type_sunx86 = UFS_MOUNT_UFSTYPE_SUNx86,
Opt_type_sun = UFS_MOUNT_UFSTYPE_SUN,
Opt_type_sunos = UFS_MOUNT_UFSTYPE_SUNOS,
Opt_type_44bsd = UFS_MOUNT_UFSTYPE_44BSD,
Opt_type_ufs2 = UFS_MOUNT_UFSTYPE_UFS2,
Opt_type_hp = UFS_MOUNT_UFSTYPE_HP,
Opt_type_nextstepcd = UFS_MOUNT_UFSTYPE_NEXTSTEP_CD,
Opt_type_nextstep = UFS_MOUNT_UFSTYPE_NEXTSTEP,
Opt_type_openstep = UFS_MOUNT_UFSTYPE_OPENSTEP,
Opt_onerror_panic = UFS_MOUNT_ONERROR_PANIC,
Opt_onerror_lock = UFS_MOUNT_ONERROR_LOCK,
Opt_onerror_umount = UFS_MOUNT_ONERROR_UMOUNT,
Opt_onerror_repair = UFS_MOUNT_ONERROR_REPAIR,
Opt_err
};
static match_table_t tokens __attribute__((used)) = {
{ Opt_type_old, "old" },
{ Opt_type_sunx86, "sunx86" },
{ Opt_type_sun, "sun" },
{ Opt_type_sunos, "sunos" },
{ Opt_type_44bsd, "44bsd" },
{ Opt_type_ufs2, "ufs2" },
{ Opt_type_ufs2, "5xbsd" },
{ Opt_type_hp, "hp" },
{ Opt_type_nextstepcd, "nextstep-cd" },
{ Opt_type_nextstep, "nextstep" },
{ Opt_type_openstep, "openstep" },
/* end of possible ufs types */
{ Opt_onerror_panic, "onerror=panic" },
{ Opt_onerror_lock, "onerror=lock" },
{ Opt_onerror_umount, "onerror=umount" },
{ Opt_onerror_repair, "onerror=repair" },
{ Opt_err, NULL}
};
static void
ufs_print_super_stuff(struct super_block* sb,
struct ufs_super_block_first* usb1,
struct ufs_super_block_second* usb2,
struct ufs_super_block_third* usb3)
{
u32 magic = fs32_to_cpu(sb, usb3->fs_magic);
printk("ufs_print_super_stuff\n");
printk(" magic: 0x%x\n", magic);
if (fs32_to_cpu(sb, usb3->fs_magic) == UFS2_MAGIC) {
printk(" fs_size: %llu\n", (unsigned long long)
fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size));
printk(" fs_dsize: %llu\n", (unsigned long long)
fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize));
printk(" bsize: %u\n",
fs32_to_cpu(sb, usb1->fs_bsize));
printk(" fsize: %u\n",
fs32_to_cpu(sb, usb1->fs_fsize));
printk(" fs_volname: %s\n", usb2->fs_un.fs_u2.fs_volname);
printk(" fs_sblockloc: %llu\n", (unsigned long long)
fs64_to_cpu(sb, usb2->fs_un.fs_u2.fs_sblockloc));
printk(" cs_ndir(No of dirs): %llu\n", (unsigned long long)
fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir));
printk(" cs_nbfree(No of free blocks): %llu\n",
(unsigned long long)
fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree));
printk(KERN_INFO" cs_nifree(Num of free inodes): %llu\n",
(unsigned long long)
fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree));
printk(KERN_INFO" cs_nffree(Num of free frags): %llu\n",
(unsigned long long)
fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree));
printk(KERN_INFO" fs_maxsymlinklen: %u\n",
fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen));
} else {
printk(" sblkno: %u\n", fs32_to_cpu(sb, usb1->fs_sblkno));
printk(" cblkno: %u\n", fs32_to_cpu(sb, usb1->fs_cblkno));
printk(" iblkno: %u\n", fs32_to_cpu(sb, usb1->fs_iblkno));
printk(" dblkno: %u\n", fs32_to_cpu(sb, usb1->fs_dblkno));
printk(" cgoffset: %u\n",
fs32_to_cpu(sb, usb1->fs_cgoffset));
printk(" ~cgmask: 0x%x\n",
~fs32_to_cpu(sb, usb1->fs_cgmask));
printk(" size: %u\n", fs32_to_cpu(sb, usb1->fs_size));
printk(" dsize: %u\n", fs32_to_cpu(sb, usb1->fs_dsize));
printk(" ncg: %u\n", fs32_to_cpu(sb, usb1->fs_ncg));
printk(" bsize: %u\n", fs32_to_cpu(sb, usb1->fs_bsize));
printk(" fsize: %u\n", fs32_to_cpu(sb, usb1->fs_fsize));
printk(" frag: %u\n", fs32_to_cpu(sb, usb1->fs_frag));
printk(" fragshift: %u\n",
fs32_to_cpu(sb, usb1->fs_fragshift));
printk(" ~fmask: %u\n", ~fs32_to_cpu(sb, usb1->fs_fmask));
printk(" fshift: %u\n", fs32_to_cpu(sb, usb1->fs_fshift));
printk(" sbsize: %u\n", fs32_to_cpu(sb, usb1->fs_sbsize));
printk(" spc: %u\n", fs32_to_cpu(sb, usb1->fs_spc));
printk(" cpg: %u\n", fs32_to_cpu(sb, usb1->fs_cpg));
printk(" ipg: %u\n", fs32_to_cpu(sb, usb1->fs_ipg));
printk(" fpg: %u\n", fs32_to_cpu(sb, usb1->fs_fpg));
printk(" csaddr: %u\n", fs32_to_cpu(sb, usb1->fs_csaddr));
printk(" cssize: %u\n", fs32_to_cpu(sb, usb1->fs_cssize));
printk(" cgsize: %u\n", fs32_to_cpu(sb, usb1->fs_cgsize));
printk(" fstodb: %u\n",
fs32_to_cpu(sb, usb1->fs_fsbtodb));
printk(" nrpos: %u\n", fs32_to_cpu(sb, usb3->fs_nrpos));
printk(" ndir %u\n",
fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir));
printk(" nifree %u\n",
fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree));
printk(" nbfree %u\n",
fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree));
printk(" nffree %u\n",
fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree));
}
printk("\n");
}
static void
ufs_print_cylinder_stuff(struct super_block* sb, struct ufs_cylinder_group* cg)
{
printk("\nufs_print_cylinder_stuff\n");
printk("size of ucg: %zu\n", sizeof(struct ufs_cylinder_group));
printk(" magic: %x\n", fs32_to_cpu(sb, cg->cg_magic));
printk(" time: %u\n", fs32_to_cpu(sb, cg->cg_time));
printk(" cgx: %u\n", fs32_to_cpu(sb, cg->cg_cgx));
printk(" ncyl: %u\n", fs16_to_cpu(sb, cg->cg_ncyl));
printk(" niblk: %u\n", fs16_to_cpu(sb, cg->cg_niblk));
printk(" ndblk: %u\n", fs32_to_cpu(sb, cg->cg_ndblk));
printk(" cs_ndir: %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_ndir));
printk(" cs_nbfree: %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nbfree));
printk(" cs_nifree: %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nifree));
printk(" cs_nffree: %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nffree));
printk(" rotor: %u\n", fs32_to_cpu(sb, cg->cg_rotor));
printk(" frotor: %u\n", fs32_to_cpu(sb, cg->cg_frotor));
printk(" irotor: %u\n", fs32_to_cpu(sb, cg->cg_irotor));
printk(" frsum: %u, %u, %u, %u, %u, %u, %u, %u\n",
fs32_to_cpu(sb, cg->cg_frsum[0]), fs32_to_cpu(sb, cg->cg_frsum[1]),
fs32_to_cpu(sb, cg->cg_frsum[2]), fs32_to_cpu(sb, cg->cg_frsum[3]),
fs32_to_cpu(sb, cg->cg_frsum[4]), fs32_to_cpu(sb, cg->cg_frsum[5]),
fs32_to_cpu(sb, cg->cg_frsum[6]), fs32_to_cpu(sb, cg->cg_frsum[7]));
printk(" btotoff: %u\n", fs32_to_cpu(sb, cg->cg_btotoff));
printk(" boff: %u\n", fs32_to_cpu(sb, cg->cg_boff));
printk(" iuseoff: %u\n", fs32_to_cpu(sb, cg->cg_iusedoff));
printk(" freeoff: %u\n", fs32_to_cpu(sb, cg->cg_freeoff));
printk(" nextfreeoff: %u\n", fs32_to_cpu(sb, cg->cg_nextfreeoff));
printk(" clustersumoff %u\n",
fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clustersumoff));
printk(" clusteroff %u\n",
fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clusteroff));
printk(" nclusterblks %u\n",
fs32_to_cpu(sb, cg->cg_u.cg_44.cg_nclusterblks));
printk("\n");
}
static int
ufs_parse_options(char* options, unsigned* mount_options)
{
char* p;
UFSD("ENTER\n");
if (!options)
return 1;
while ((p = strsep(&options, ",")) != NULL) {
substring_t args[MAX_OPT_ARGS];
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_type_old:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_OLD);
break;
case Opt_type_sunx86:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_SUNx86);
break;
case Opt_type_sun:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_SUN);
break;
case Opt_type_sunos:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_SUNOS);
break;
case Opt_type_44bsd:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_44BSD);
break;
case Opt_type_ufs2:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_UFS2);
break;
case Opt_type_hp:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_HP);
break;
case Opt_type_nextstepcd:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_NEXTSTEP_CD);
break;
case Opt_type_nextstep:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_NEXTSTEP);
break;
case Opt_type_openstep:
ufs_clear_opt(*mount_options, UFSTYPE);
ufs_set_opt(*mount_options, UFSTYPE_OPENSTEP);
break;
case Opt_onerror_panic:
ufs_clear_opt(*mount_options, ONERROR);
ufs_set_opt(*mount_options, ONERROR_PANIC);
break;
case Opt_onerror_lock:
ufs_clear_opt(*mount_options, ONERROR);
ufs_set_opt(*mount_options, ONERROR_LOCK);
break;
case Opt_onerror_umount:
ufs_clear_opt(*mount_options, ONERROR);
ufs_set_opt(*mount_options, ONERROR_UMOUNT);
break;
case Opt_onerror_repair:
printk("UFS-fs: Unable to do repair on error, "
"will lock lock instead\n");
ufs_clear_opt(*mount_options, ONERROR);
ufs_set_opt(*mount_options, ONERROR_REPAIR);
break;
default:
printk("UFS-fs: Invalid option: \"%s\" or missing value\n", p);
return 0;
}
}
return 1;
}
static void
ufs_setup_cstotal(struct super_block* sb)
{
struct ufs_sb_info* sbi = UFS_SB(sb);
struct ufs_sb_private_info* uspi = sbi->s_uspi;
struct ufs_super_block_first* usb1;
struct ufs_super_block_second* usb2;
struct ufs_super_block_third* usb3;
unsigned mtype = sbi->s_mount_opt & UFS_MOUNT_UFSTYPE;
UFSD("ENTER, mtype=%u\n", mtype);
usb1 = ubh_get_usb_first(uspi);
usb2 = ubh_get_usb_second(uspi);
usb3 = ubh_get_usb_third(uspi);
if ((mtype == UFS_MOUNT_UFSTYPE_44BSD &&
(usb1->fs_flags & UFS_FLAGS_UPDATED)) ||
(mtype == UFS_MOUNT_UFSTYPE_UFS2)) {
uspi->cs_total.cs_ndir = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir);
uspi->cs_total.cs_nbfree = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree);
uspi->cs_total.cs_nifree =
fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree);
uspi->cs_total.cs_nffree =
fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree);
} else {
uspi->cs_total.cs_ndir = fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir);
uspi->cs_total.cs_nbfree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree);
uspi->cs_total.cs_nifree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree);
uspi->cs_total.cs_nffree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree);
}
UFSD("EXIT\n");
}
static int
ufs_read_cylinder_structures(struct super_block* sb)
{
struct ufs_sb_info* sbi = UFS_SB(sb);
struct ufs_sb_private_info* uspi = sbi->s_uspi;
struct ufs_buffer_head* ubh;
unsigned char* base;
unsigned char* space;
unsigned size, blks, i;
struct ufs_super_block_third* usb3;
UFSD("ENTER\n");
usb3 = ubh_get_usb_third(uspi);
/* Read cs structures from (usually) first data block on the device. */
size = uspi->s_cssize;
blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
base = space = kmalloc(size, GFP_KERNEL);
if (!base)
goto failed;
sbi->s_csp = (struct ufs_csum*)space;
for (i = 0; i < blks; i += uspi->s_fpb) {
size = uspi->s_bsize;
if (i + uspi->s_fpb > blks)
size = (blks - i) * uspi->s_fsize;
ubh = ubh_bread(sb, uspi->s_csaddr + i, size);
if (!ubh)
goto failed;
ubh_ubhcpymem (space, ubh, size);
space += size;
ubh_brelse (ubh);
ubh = NULL;
}
/*
* Read cylinder group (we read only first fragment from block
* at this time) and prepare internal data structures for cg caching.
*/
if (!(sbi->s_ucg = kmalloc(sizeof(struct buffer_head*) * uspi->s_ncg,
GFP_KERNEL)))
goto failed;
for (i = 0; i < uspi->s_ncg; i++)
sbi->s_ucg[i] = NULL;
for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
sbi->s_ucpi[i] = NULL;
sbi->s_cgno[i] = UFS_CGNO_EMPTY;
}
for (i = 0; i < uspi->s_ncg; i++) {
UFSD("read cg %u\n", i);
if (!(sbi->s_ucg[i] = sb_bread(sb, ufs_cgcmin(i))))
goto failed;
if (!ufs_cg_chkmagic(sb,
(struct ufs_cylinder_group*)sbi->s_ucg[i]->b_data))
goto failed;
ufs_print_cylinder_stuff(sb,
(struct ufs_cylinder_group*)sbi->s_ucg[i]->b_data);
}
for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
if (!(sbi->s_ucpi[i] = kmalloc(sizeof(struct ufs_cg_private_info),
GFP_KERNEL)))
goto failed;
sbi->s_cgno[i] = UFS_CGNO_EMPTY;
}
sbi->s_cg_loaded = 0;
UFSD("EXIT\n");
return 1;
failed:
kfree(base);
if (sbi->s_ucg) {
for (i = 0; i < uspi->s_ncg; i++)
if (sbi->s_ucg[i])
brelse (sbi->s_ucg[i]);
kfree (sbi->s_ucg);
for (i = 0; i < UFS_MAX_GROUP_LOADED; i++)
kfree (sbi->s_ucpi[i]);
}
UFSD("EXIT (FAILED)\n");
return 0;
}
static int
ufs_block_to_path(struct inode* inode, sector_t i_block, sector_t offsets[4])
{
struct ufs_sb_private_info* uspi = UFS_SB(inode->I_sb)->s_uspi;
int ptrs = uspi->s_apb;
int ptrs_bits = uspi->s_apbshift;
const long direct_blocks = UFS_NDADDR,
indirect_blocks = ptrs,
double_blocks = (1 << (ptrs_bits * 2));
int n = 0;
UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
if (i_block < direct_blocks) {
offsets[n++] = i_block;
} else if ((i_block -= direct_blocks) < indirect_blocks) {
offsets[n++] = UFS_IND_BLOCK;
offsets[n++] = i_block;
} else if ((i_block -= indirect_blocks) < double_blocks) {
offsets[n++] = UFS_DIND_BLOCK;
offsets[n++] = i_block >> ptrs_bits;
offsets[n++] = i_block & (ptrs - 1);
} else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
offsets[n++] = UFS_TIND_BLOCK;
offsets[n++] = i_block >> (ptrs_bits * 2);
offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
offsets[n++] = i_block & (ptrs - 1);
} else {
fprintf(stderr, "ufs_block_to_path: block > big\n");
}
return n;
}
/* Returns the location of the fragment from the begining of the filesystem. */
static u64
ufs_frag_map(struct inode* inode, sector_t frag, int* error)
{
struct ufs_inode_info* ufsi = inode->I_private;
struct super_block* sb = inode->I_sb;
struct ufs_sb_private_info* uspi = UFS_SB(sb)->s_uspi;
u64 mask = (u64)uspi->s_apbmask>>uspi->s_fpbshift;
int shift = uspi->s_apbshift-uspi->s_fpbshift;
unsigned flags = UFS_SB(sb)->s_flags;
sector_t offsets[4];
sector_t* p;
int depth = ufs_block_to_path(inode, frag >> uspi->s_fpbshift, offsets);
u64 ret = 0L;
u64 temp = 0L;
__fs32 block;
__fs64 u2_block = 0L;
UFSD(": frag = %llu depth = %d\n", (unsigned long long)frag, depth);
UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
uspi->s_fpbshift, uspi->s_apbmask, (unsigned long long)mask);
if (depth == 0)
return 0;
p = offsets;
lock_kernel();
if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
goto ufs2;
block = ufsi->i_u1.i_data[*p++];
if (!block)
goto out;
while (--depth) {
struct buffer_head _bh;
struct buffer_head* bh = &_bh;
sector_t n = *p++;
bh->b_flags.dynamic = 0;
if (sb_bread_intobh(sb, uspi->s_sbbase +
fs32_to_cpu(sb, block) + (n >> shift), bh) != 0)
goto out;
block = ((__fs32 *) bh->b_data)[n & mask];
brelse (bh);
if (!block)
goto out;
}
ret = (u64)(uspi->s_sbbase + fs32_to_cpu(sb, block) +
(frag & uspi->s_fpbmask));
goto out;
ufs2:
u2_block = ufsi->i_u1.u2_i_data[*p++];
if (!u2_block)
goto out;
while (--depth) {
struct buffer_head _bh;
struct buffer_head* bh = &_bh;
sector_t n = *p++;
temp = (u64)(uspi->s_sbbase) + fs64_to_cpu(sb, u2_block);
bh->b_flags.dynamic = 0;
if (sb_bread_intobh(sb, temp +(u64) (n>>shift), bh) != 0)
goto out;
u2_block = ((__fs64 *)bh->b_data)[n & mask];
brelse(bh);
if (!u2_block)
goto out;
}
temp = (u64)uspi->s_sbbase + fs64_to_cpu(sb, u2_block);
ret = temp + (u64)(frag & uspi->s_fpbmask);
out:
unlock_kernel();
return ret;
}
int
ufs_getfrag_block(struct inode* inode, sector_t fragment,
struct buffer_head* bh_result, int create)
{
int err;
u64 phys64 = 0;
struct super_block* sb = inode->I_sb;
if (!create) {
phys64 = ufs_frag_map(inode, fragment, &err);
UFSD("phys64 = %llu\n", (unsigned long long)phys64);
if (phys64) {
bh_result->b_blocknr = phys64; /* map_bh */
bh_result->b_size = sb->s_blocksize; /* map_bh */
return 0;
}
}
return -1;
}
static struct buffer_head*
ufs_getfrag(struct inode* inode, unsigned int fragment, int create, int* err)
{
struct buffer_head dummy;
int error;
dummy.b_blocknr = -1000;
error = ufs_getfrag_block(inode, fragment, &dummy, create);
*err = error;
if (!error) {
struct buffer_head *bh;
bh = sb_getblk(inode->I_sb, dummy.b_blocknr);
return bh;
}
return NULL;
}
/* We don't use this. */
struct buffer_head*
ufs_bread(struct inode* inode, unsigned fragment, int create, int* err)
{
struct buffer_head* bh;
UFSD("ENTER, ino %llu, fragment %u\n", inode->I_ino, fragment);
bh = ufs_getfrag(inode, fragment, create, err);
if (!bh)
return bh;
struct buffer_head* bhnew = sb_bread(inode->I_sb, bh->b_blocknr);
brelse(bh);
return bhnew;
}
static int
ufs1_read_inode(struct inode* inode, struct ufs_inode* ufs_inode)
{
struct ufs_inode_info* ufsi = inode->I_private;
struct super_block* sb = inode->I_sb;
mode_t mode;
unsigned i;
inode->I_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
inode->I_nlink = fs16_to_cpu(sb, ufs_inode->ui_nlink);
if (inode->I_nlink == 0) {
fprintf(stderr,
"ufs_read_inode: inode %llu has zero nlink\n", inode->I_ino);
return -1;
}
inode->I_uid = ufs_get_inode_uid(sb, ufs_inode);
inode->I_gid = ufs_get_inode_gid(sb, ufs_inode);
inode->I_size = fs64_to_cpu(sb, ufs_inode->ui_size);
inode->I_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
inode->I_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
inode->I_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
inode->I_mtime.tv_nsec = 0;
inode->I_atime.tv_nsec = 0;
inode->I_ctime.tv_nsec = 0;
inode->I_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
inode->I_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
inode->I_flags = fs32_to_cpu(sb, ufs_inode->ui_flags); /* XXX */
ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
if (S_ISCHR(mode) || S_ISBLK(mode) || inode->I_blocks) {
for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
ufsi->i_u1.i_data[i] = ufs_inode->ui_u2.ui_addr.ui_db[i];
} else {
for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
ufsi->i_u1.i_symlink[i] = ufs_inode->ui_u2.ui_symlink[i];
}
return 0;
}
static int
ufs2_read_inode(struct inode* inode, struct ufs2_inode* ufs2_inode)
{
struct ufs_inode_info* ufsi = inode->I_private;
struct super_block* sb = inode->I_sb;
mode_t mode;
unsigned i;
UFSD("Reading ufs2 inode, ino %llu\n", inode->I_ino);
inode->I_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
inode->I_nlink = fs16_to_cpu(sb, ufs2_inode->ui_nlink);
if (inode->I_nlink == 0) {
fprintf(stderr,
"ufs_read_inode: inode %llu has zero nlink\n", inode->I_ino);
return -1;
}
inode->I_uid = fs32_to_cpu(sb, ufs2_inode->ui_uid);
inode->I_gid = fs32_to_cpu(sb, ufs2_inode->ui_gid);
inode->I_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
inode->I_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
inode->I_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
inode->I_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
inode->I_crtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_birthtime);
inode->I_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
inode->I_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
inode->I_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
inode->I_crtime.tv_nsec= fs32_to_cpu(sb, ufs2_inode->ui_birthnsec);
inode->I_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
inode->I_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
/*
* ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
* ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
*/
if (S_ISCHR(mode) || S_ISBLK(mode) || inode->I_blocks) {
for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
ufsi->i_u1.u2_i_data[i] =
ufs2_inode->ui_u2.ui_addr.ui_db[i];
} else {
for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
ufsi->i_u1.i_symlink[i] = ufs2_inode->ui_u2.ui_symlink[i];
}
return 0;
}
static inline int
ufs_match(struct super_block* sb, int len, const char* const name,
struct ufs_dir_entry* de)
{
if (len != ufs_get_de_namlen(sb, de))
return 0;
if (!de->d_ino)
return 0;
return !memcmp(name, de->d_name, len);
}
static inline struct ufs_dir_entry*
ufs_next_entry(struct super_block* sb, struct ufs_dir_entry* p)
{
return (struct ufs_dir_entry*)((char*)p + fs16_to_cpu(sb, p->d_reclen));
}
#if 0 /* unused */
static inline unsigned
ufs_validate_entry(struct super_block* sb, char* base, unsigned offset,
unsigned mask)
{
struct ufs_dir_entry* de = (struct ufs_dir_entry*)(base + offset);
struct ufs_dir_entry* p = (struct ufs_dir_entry*)(base + (offset & mask));
while ((char*)p < (char*)de) {
if (p->d_reclen == 0)
break;
p = ufs_next_entry(sb, p);
}
return (char*)p - base;
}
#endif /* 0 */
static inline unsigned long
ufs_dir_pages(struct inode *inode)
{
return (inode->I_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
}
static int
ufs_check_page(struct inode* dir, sector_t index, char* page)
{
struct super_block* sb = dir->I_sb;
char* kaddr = (char*)page;
unsigned offs, rec_len;
unsigned limit = PAGE_CACHE_SIZE;
const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
struct ufs_dir_entry*p;
char* error;
int fres = -1;
if ((dir->I_size >> PAGE_CACHE_SHIFT) == index) {
limit = dir->I_size & ~PAGE_CACHE_MASK;
if (limit & chunk_mask)
goto Ebadsize;
if (!limit)
goto out;
}
for (offs = 0; offs <= limit - UFS_DIR_REC_LEN(1); offs += rec_len) {
p = (struct ufs_dir_entry*)(kaddr + offs);
rec_len = fs16_to_cpu(sb, p->d_reclen);
if (rec_len < UFS_DIR_REC_LEN(1))
goto Eshort;
if (rec_len & 3)
goto Ealign;
if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
goto Enamelen;
if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
goto Espan;
if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
UFS_SB(sb)->s_uspi->s_ncg))
goto Einumber;
}
if (offs != limit)
goto Eend;
out:
return 0; /* good */
Ebadsize:
fprintf(stderr, "ufs_check_page: size of directory #%llu is "
"not a multiple of chunk size", dir->I_ino);
goto fail;
Eshort:
error = "rec_len is smaller than minimal";
goto bad_entry;
Ealign:
error = "unaligned directory entry";
goto bad_entry;
Enamelen:
error = "rec_len is too small for name_len";
goto bad_entry;
Espan:
error = "directory entry across blocks";
goto bad_entry;
Einumber:
error = "inode out of bounds";
bad_entry:
fprintf(stderr, "ufs_check_page: bad entry in directory #%llu: %s - "
"offset=%llu, rec_len=%d, name_len=%d",
dir->I_ino, error, (index << PAGE_CACHE_SHIFT) + offs,
rec_len, ufs_get_de_namlen(sb, p));
goto fail;
Eend:
fprintf(stderr, "entry in directory #%llu spans the page boundary"
"offset=%llu", dir->I_ino, (index << PAGE_CACHE_SHIFT) + offs);
fail:
return fres;
}
static unsigned
ufs_last_byte(struct inode* inode, unsigned long page_nr)
{
unsigned last_byte = inode->I_size;
last_byte -= page_nr << PAGE_CACHE_SHIFT;
if (last_byte > PAGE_CACHE_SIZE)
last_byte = PAGE_CACHE_SIZE;
return last_byte;
}
static struct ufs_dir_entry*
ufs_dotdot_s(struct inode* dir, char* pagebuf)
{
int ret = ufs_get_dirpage(dir, 0, pagebuf);
struct ufs_dir_entry* de = NULL;
if (ret == 0)
de = ufs_next_entry(dir->I_sb, (struct ufs_dir_entry*)pagebuf);
return de;
}
static int
ufs_get_dirpage(struct inode* inode, sector_t index, char* pagebuf)
{
int ret = U_ufs_get_page(inode, index, pagebuf);
/* if (ufs_check_page(inode, index, pagebuf) != 0) return -1; */
return ret;
}
static ino_t
ufs_find_entry_s(struct inode* dir, const char* name)
{
struct super_block* sb = dir->I_sb;
struct ufs_inode_info* ui = dir->I_private;
int namelen = strlen(name);
unsigned reclen = UFS_DIR_REC_LEN(namelen);
unsigned long npages = ufs_dir_pages(dir);
unsigned long start, n;
struct ufs_dir_entry* de;
ino_t result = 0;
UFSD("ENTER, dir_ino %llu, name %s, namlen %u\n",
dir->I_ino, name, namelen);
if (npages == 0 || namelen > UFS_MAXNAMLEN)
goto out;
start = ui->i_dir_start_lookup;
if (start >= npages)
start = 0;
n = start;
do {
char page[PAGE_SIZE];
char* kaddr;
if (ufs_get_dirpage(dir, n, page) == 0) {
kaddr = page;
de = (struct ufs_dir_entry*)kaddr;
kaddr += ufs_last_byte(dir, n) - reclen;
while ((char*)de <= kaddr) {
if (de->d_reclen == 0) {
fprintf(stderr, "zero-length directory entry\n");
goto out;
}
if (ufs_match(sb, namelen, (char*)name, de)) {
result = fs32_to_cpu(sb, de->d_ino);
goto found;
}
de = ufs_next_entry(sb, de);
}
}
if (++n >= npages)
n = 0;
} while (n != start);
out:
return result;
found:
ui->i_dir_start_lookup = n;
return result;
}
struct super_block*
U_ufs_fill_super(int fd, void* data, int silent)
{
struct super_block* sb = NULL;
struct ufs_sb_info* sbi = NULL;
struct ufs_sb_private_info* uspi;
struct ufs_super_block_first* usb1;
struct ufs_super_block_second* usb2;
struct ufs_super_block_third* usb3;
struct ufs_buffer_head* ubh;
unsigned block_size, super_block_size;
unsigned flags, super_block_offset;
uspi = NULL;
ubh = NULL;
flags = 0;
UFSD("ENTER\n");
sb = calloc(1, sizeof(struct super_block));
if (!sb)
return NULL;
sb->s_bdev = fd;
sb->s_flags |= MS_RDONLY;
sbi = kzalloc(sizeof(struct ufs_sb_info), GFP_KERNEL);
if (!sbi)
goto failed_nomem;
sbi->s_mount_opt = 0;
sb->s_fs_info = sbi;
ufs_set_opt(sbi->s_mount_opt, ONERROR_LOCK);
if (!ufs_parse_options((char*) data, &sbi->s_mount_opt)) {